Shopify SMS Marketing: The Complete 2026 Guide for Store Owners

SMS is the channel Shopify store owners either treat as a revenue weapon or ignore until a competitor takes their customers. The math is brutal: text messages get opened almost immediately, but you only get one shot to set up consent, frequency, and content correctly. Burn it, and you'll watch your hard-earned list opt out in a single send.

This guide walks through how to do Shopify SMS marketing properly in 2026 — the opt-in mechanics, the compliance rules that actually matter, the five automated flows every store should be running, what it actually costs, and how the major Shopify-friendly SMS apps stack up.

If you're already running email marketing on Shopify and you don't have SMS yet, this is probably the highest-ROI marketing addition you can make this quarter.

Why SMS for Shopify (and the one big tradeoff)

The widely-cited "98% SMS open rate" figure is more of an industry benchmark than a precisely measured number — multiple analysts have pointed out it's been repeated since the early 2000s without rigorous source tracing.¹ Still, every recent study agrees SMS open rates sit somewhere between 95% and 99%, and most opens happen within minutes of delivery.¹ Compared to email's 20–40% open rate, SMS is in a different category of attention.

That attention has a price. SMS click-through rates for ecommerce average 21–35%, and abandoned cart SMS conversion rates have been measured at 24.6–39.4%.² Those numbers blow email out of the water on engagement.

The tradeoff: SMS deliverability is binary. The recipient either opted in or they didn't. There's no inbox tab to land in. There's no warming, no "good sender reputation" softening the blow if you misuse the channel. If you over-message, your list unsubscribes at a rate you can watch in real time. If you violate TCPA, you can face statutory damages of $500–$1,500 per message, per recipient, under a private right of action.³

The store owners who win with SMS treat it as a scarce resource. They earn the opt-in honestly, they send rarely, and every message has a clear reason to exist. That's the entire playbook.

How SMS marketing on Shopify actually works

There are three things you need before sending your first SMS campaign on a US Shopify store: a way to collect consent, a registered phone number, and an app to send from.

Opt-in mechanics

You have four main ways to collect SMS subscribers:

1. Shopify's native checkout consent. As of late 2023, Shopify lets you collect SMS marketing consent directly at checkout via a checkbox.⁴ You enable this in Shopify admin under Settings → Checkout → Marketing options → toggle on SMS. The consent is synced to Shopify whether or not the order is completed.⁴ About 60% of marketing consent on Shopify-powered stores is gathered at checkout, so this is the single highest-volume lever you have.⁴

2. Popup forms with explicit SMS consent. Most Shopify SMS apps include popup builders. The form must clearly state that ticking the box opts the visitor into marketing texts, list the frequency, mention message/data rates, and link to terms and privacy.

3. SMS keywords ("Text JOIN to 12345"). Customers text a keyword to a short code or 10DLC number, then receive a confirmation message asking them to reply Y to confirm. This is the cleanest opt-in legally — it's a deliberate action from the subscriber.

4. Embedded forms in landing pages, footers, and post-purchase pages. These convert lower than popups but accumulate over time.

Whichever method you use, the consent language has to be clear and conspicuous — meaning a customer cannot miss that they are agreeing to receive marketing texts.⁵

10DLC registration (US)

If you're sending SMS to US recipients from a 10-digit local phone number, you need A2P 10DLC registration before you send a single message.⁶ This is non-negotiable — unregistered 10DLC traffic gets filtered, blocked, or throttled by carriers.⁶

Registration has two parts:⁶

1. Brand registration — your business identity, verified against EIN and official records
2. Campaign registration — the use case (marketing, transactional, 2FA, etc.) plus 2–3 sample messages

Most Shopify SMS apps will walk you through this during onboarding. Expect a one-time brand fee (commonly $4) and a monthly campaign fee (commonly $10–$15 per campaign, charged by The Campaign Registry through your provider). Your SMS app may pass these through or absorb them — check before you sign up.

Short codes vs long codes (10DLC)

For most Shopify stores, a 10DLC long code is the right starting point.

Number type	Cost	Throughput	Best for
10DLC long code	~$1–2/mo rental + per-message fees7	1–75 message segments per second7	Most Shopify stores under $5M GMV
Short code	~$500/mo and up; annual cost commonly $11,000–$17,0007	Up to 400 message segments per second7	High-volume senders with large lists
Toll-free	~$2.15/mo on Twilio8	Higher than long code; needs verification	Stores that want a memorable, non-local number

Unless you're sending hundreds of thousands of messages per month, you don't need a short code.

Compliance for Shopify SMS in 2026

This section is a starting point, not legal advice. Compliance rules change, and a real lawyer who knows your store, your states, and your international footprint is the only person who can tell you what you specifically need to do. With that said, here's the floor.

TCPA basics

The Telephone Consumer Protection Act (TCPA), enforced by the FCC, requires "prior express written consent" before you send marketing SMS to a US recipient using automated technology.³ Express written consent must be a clear, conspicuous agreement signed by the consumer that explicitly says they agree to receive marketing texts.³ A pre-checked box doesn't count. Burying the consent language in your terms of service doesn't count.

Statutory damages under TCPA are $500 per violation, going up to $1,500 for willful violations.³ There's a private right of action — meaning a single annoyed consumer can sue you, no government enforcement required.

STOP, HELP, and the opt-out auto-responder

The CTIA Messaging Principles and Best Practices require that every promotional SMS program honor opt-out keywords (STOP, UNSUBSCRIBE, CANCEL, END, QUIT) and the help keyword (HELP).⁵ When a recipient texts STOP, you must immediately stop sending and send a single confirmation message acknowledging the opt-out.⁵ Every SMS marketing app for Shopify handles this automatically — but verify it's enabled before your first send.

The FCC's updated rules that took effect in 2025 require that opt-out requests be honored across all categories of messages from that sender, not just the specific campaign.⁹

Frequency disclosure and message/data rates

Your opt-in language must disclose the expected message frequency (e.g., "up to 6 messages per month") and state "Msg & data rates may apply."⁵ This isn't optional. It's part of "clear and conspicuous" consent.

Quiet hours: 8 a.m. to 9 p.m. (recipient's local time)

The TCPA prohibits sending marketing text messages before 8 a.m. or after 9 p.m. in the recipient's local time zone.⁹ Not your time zone. Theirs.

Several states are stricter:⁹

• Florida, Connecticut, Maryland, Oklahoma, Washington: 8 a.m. – 8 p.m. local time
• Texas: 9 a.m. – 9 p.m. Mon–Sat; noon – 9 p.m. Sunday

If you're sending nationally, your safe send window is roughly 11 a.m. ET to 8 p.m. PT — which translates to about 11 a.m. to 8 p.m. ET. Most Shopify SMS apps will let you set quiet hours per recipient timezone. Use that feature.

GDPR and UK considerations

If you sell into the EU or UK, you need a documented lawful basis for SMS marketing — in practice, that means specific, freely given, informed, unambiguous consent under GDPR Article 7. The "soft opt-in" exemption (PECR in the UK) allows existing customers to be marketed to for similar products without fresh consent, but only with a clear opt-out at the point of data collection. International stores often run separate SMS programs by region for this reason.

Bottom line: in the US, get explicit written consent, honor STOP immediately, respect quiet hours by recipient timezone, and disclose frequency. In the EU/UK, get specific consent and document it.

The 5 SMS flows every Shopify store should run

If you're going to set up SMS once and let it generate revenue in the background, these are the five automated flows that earn their keep. Each one has a clear trigger, a tight timing window, and a job to do.

1. Welcome / opt-in confirmation

Trigger: New SMS subscriber (from checkout, popup, or keyword) Timing: Immediate — within 30 seconds Job: Set expectations, deliver the promised incentive, prove you'll respect their inbox

Example (this is what a good welcome SMS looks like):

Welcome to Bramble & Co! Here's 15% off your first order: BRAMBLE15. Up to 6 msgs/mo. Msg & data rates may apply. Reply STOP to opt out. https://brambleco.com/15

What NOT to do: Don't send the welcome SMS three hours after signup. By then they've forgotten signing up and will think you spammed them. Don't omit the frequency disclosure and STOP language — both are required.

2. Abandoned cart SMS

Trigger: Cart abandoned (Shopify event) Timing: First SMS at 30–60 minutes after abandonment. Second message (if you send one) at 24 hours. Job: Recover the sale before the intent fades

Abandoned cart SMS has been measured at 24.6–39.4% conversion rates in ecommerce.² One Postscript-cited benchmark shows abandoned cart SMS sent ~30 minutes after abandonment getting 28% CTR and 12.5% CVR.²

Example:

Hey Maria, your cart's still waiting. Want us to hold it? Here's 10% off: COMEBACK10 (24h) https://brambleco.com/cart/abc

What NOT to do: Don't include a discount on the first SMS for cart values above a threshold (say $80). Plenty of customers will complete without one. Don't send abandoned cart SMS to subscribers who already converted in the last 24 hours.

3. Post-purchase

Trigger: Order placed Timing: Order confirmation SMS within minutes (transactional, doesn't burn marketing budget). Marketing follow-up 5–10 days after delivery. Job: Confirm the order, then re-engage for review or cross-sell once they've used the product

Example follow-up (day 7 post-delivery):

How's the cold brew kit treating you, Maria? Tap to share a review (we read every one). https://brambleco.com/review

What NOT to do: Don't conflate transactional order updates with marketing. Order confirmations don't need marketing consent — but the moment you bundle a promo into the same message, it becomes marketing and requires it.

4. Back-in-stock

Trigger: Product the subscriber requested an alert for is restocked Timing: Within minutes of restock, batched if you have inventory spikes Job: Convert the highest-intent traffic you have — they literally asked you to text them

Example:

Cold Brew Concentrate is back. We've got 40 left. Yours: https://brambleco.com/products/cold-brew

This is the closest thing to a guaranteed conversion you'll send. Treat the back-in-stock list as separate consent from your general marketing list — they signed up for one alert, not weekly promotions.

What NOT to do: Don't migrate back-in-stock signups into your general SMS marketing list without re-consenting them.

5. Win-back

Trigger: No purchase in N days (90–180 depending on average order cadence) Timing: Single send, with a follow-up only if they engage Job: Rescue accounts before they go fully dormant or, more honestly, identify the ones you've already lost

Example:

Maria, it's been a while. Here's 20% off if you're in the mood: WELCOMEBACK20. No pressure. https://brambleco.com

What NOT to do: Don't run win-back to subscribers who never bought (those are pre-purchase, not win-back — they need a different flow). Don't fire it more than once a quarter to the same customer.

For more on what flow architecture looks like end-to-end, see our Shopify email marketing guide — most of the same principles apply, with shorter copy and tighter timing.

SMS vs email: when to use which

Scenario	SMS	Email
Flash sale ending in 4 hours	Yes	Maybe
Newsletter / brand storytelling	No	Yes
Abandoned cart, first touch	SMS at 30 min	Email at 1 hour
Order confirmation	Yes (transactional)	Yes
Back-in-stock	Yes (immediate)	Yes (slower)
Product education / how-to	No	Yes
Win-back to lapsed customer	Single SMS	Email sequence
Holiday promo blast	One SMS	Multi-email sequence
Review request post-purchase	Yes (day 5–7)	Yes

The shortcut: use SMS when timing matters more than detail. Use email when detail matters more than timing. Use both, sequenced, when the stakes are high (BFCM, product launches, abandoned high-value carts).

If you're still deciding which email platform to pair with SMS, we've written a breakdown of the best email marketing apps for Shopify and an Omnisend vs Klaviyo comparison for Shopify stores.

SMS frequency and fatigue

The single most common mistake new Shopify SMS programs make: sending too often.

Across ecommerce benchmarks, the consensus range is 2–6 SMS per month for promotional sends, with 4–6 being the upper end that high-performing brands hit only when their segmentation is tight.¹⁰ One commonly-cited consumer preference survey found 42.4% of consumers prefer 4–6 SMS per month, and roughly 49% prefer once per week.¹⁰

Past 6 promotional sends per month, you start seeing unsubscribe rates climb fast. The standard signal: an unsubscribe rate above 1.5% on a send means you're sending too often or the content isn't relevant.¹⁰ If you see that, cut frequency in half and re-segment.

What to do if you see the fatigue signal:

1. Cut sends to 1–2 per month for the next 60 days
2. Segment harder — split by purchase recency, by product category interest, by past click behavior
3. Make every send earn its place. If you can't articulate why a specific segment needs this specific message right now, don't send it
4. Re-introduce frequency only after unsubscribe rate drops back below 1%

Transactional messages (order updates, shipping notifications, back-in-stock alerts the customer explicitly requested) don't count toward this frequency budget — they're not marketing.

Measuring SMS performance

Four numbers matter:

Click-through rate (CTR). What percentage of recipients tapped your link. Ecommerce SMS CTR averages 21–35%.² If you're below 15%, your copy or your link placement needs work.

Conversion rate (CVR). What percentage of recipients placed an order attributable to the send. Welcome SMS hits 15%+ CVR in well-segmented programs.² Abandoned cart SMS lands at 12.5% CVR on the immediate send.² Broadcast campaign CVR is typically 1–3%.

Revenue per send (RPS). Total attributable revenue divided by messages sent. This is the number you should optimize. A 5,000-recipient send that generates $1,500 in revenue is $0.30 RPS — strong. Sub-$0.10 RPS means your list is fatigued or your offer is weak.

Opt-out rate. Industry benchmark: aim for under 1%. Above 1.5% is the fatigue signal.¹⁰ Above 3% on a single send means something specific went wrong with that send — wrong segment, wrong time, or wrong message.

Track these in whatever SMS app you use, and look at trends, not individual sends. A bad week happens. Three bad weeks in a row is a strategy problem.

Costs to budget for

SMS marketing has three cost layers most store owners underestimate:

Layer 1: Per-message carrier costs

Per the public Twilio pricing referenced widely in the SMS industry, US SMS rates are around $0.0079 per outbound message segment on standard long codes, with carrier fees on top.⁸ Inbound messages run similarly.⁸ One segment = 160 characters of GSM-7 text; with emojis or non-Latin characters, the segment shrinks to 70 characters. A message with an emoji becomes 2–3 segments quickly.

Other published reference rates (third-party sources estimating from carrier rate cards):¹¹

• SMSBump/Yotpo: ~$0.0072/SMS plus carrier fees
• Klaviyo: ~$0.0092–$0.0120/SMS, with all carrier fees included in the credit cost
• Postscript: $0.015/SMS plus average ~$0.00384 carrier fees
• Attentive: $0.01–$0.025/segment (quote-based)

Layer 2: Platform fees

Most SMS apps charge a base monthly fee. Postscript starts free (pay-per-message only) and scales to a $25/mo Growth plan and a $500/mo Professional plan.¹² Klaviyo's email + SMS plan starts at $35/mo (500 contacts + 1,250 SMS credits) and scales with contact count.¹¹ Spoks runs $35/mo flat for unlimited contacts on email, with SMS as pay-as-you-go credits on top of that base.¹³

Layer 3: 10DLC registration

One-time brand registration through The Campaign Registry plus a per-campaign monthly fee. Most providers pass this through at roughly $4 one-time brand + $10–$15/month per campaign.⁶

Real example: a 5,000-subscriber Shopify store

Assume 4 campaigns/month at 5,000 recipients each, plus 3 automated flows averaging 500 sends/month each (1,500 automated sends). Total: 21,500 sends/month.

Using mid-market per-message pricing of $0.012/SMS (includes carrier fees, mid-range across major providers):

• Per-message cost: 21,500 × $0.012 = $258
• Platform fee: $35–$100/month depending on provider
• 10DLC: ~$15/month after one-time setup
• Total: roughly $310–$370/month

That's before deducting any platform-included SMS credits. On a flat-pricing platform like Spoks where the email base doesn't change with contact count, your only marginal cost is the SMS message volume itself — which makes budgeting predictable.

SMS apps for Shopify — verified pricing comparison

All pricing below is from vendor official pricing pages or commonly-cited third-party rate cards as of May 2026. Verify on each vendor's site before signing up — SMS pricing changes frequently.

App	Starting price	SMS pricing model	Shopify integration	Best for
Spoks	$35/mo flat (unlimited email contacts)13	Pay-as-you-go SMS credits on top of base13	Built exclusively for Shopify	Stores that want predictable email base pricing + SMS credits without contact-based tiers
Klaviyo	$35/mo (Email + SMS, 500 contacts, 1,250 SMS credits)11	Credits included in plan; overage ~$0.0092–$0.012/SMS US11	Deep Shopify integration	Stores that want bundled credits and predictive analytics
Omnisend	$59+/mo (Pro plan); SMS add-on after May 202614	New subs: $0.007+/SMS volume-based (no included credits). Legacy: SMS credit equivalent to plan price14	Native Shopify integration	Stores migrating from email-first to email+SMS
Postscript	Free Starter (pay per message); Growth $25/mo; Professional $500/mo12	$0.015/SMS + ~$0.00384 carrier fees12	Built for Shopify	High-volume Shopify-native SMS senders
Attentive	Quote-based; commonly $500+/mo, frequent minimums $2,000–$3,000/quarter15	Quote-based, ~$0.01–$0.025/segment15	Enterprise Shopify integration	Mid-market and enterprise DTC brands
SMSBump (Yotpo)	Free tier; paid plans from $19–$79/mo16	From $0.0072/SMS + carrier fees16	Native Shopify app	Stores already using Yotpo for reviews/loyalty

Where Spoks fits

Spoks is $35/month flat for unlimited email contacts with all features included. SMS is pay-as-you-go credits on top of that base — so if you're sending 5,000 SMS in a month, you pay the credit cost for those messages and nothing more.¹³ No per-contact tier increases. No SMS credit "bundles" that expire each month.

This matters for SMS specifically because most competitors meter both your contact count and your SMS volume — meaning every new subscriber raises your platform bill regardless of whether you message them, and your SMS credits get wasted (or run out) depending on the month. With Spoks, your email base stays flat at $35 and SMS scales linearly with usage.

Spoks is purpose-built for Shopify — no Magento, no WooCommerce, no BigCommerce. That focus is the tradeoff: deeper Shopify integration in exchange for not supporting other ecommerce platforms.

Honest limitations: Spoks is newer than Klaviyo or Postscript, so the feature set is narrower. No predictive analytics like Klaviyo's CLV prediction. Smaller ecosystem of third-party integrations. If you need every SMS feature under the sun, you may want a more mature platform. If you want a clean, Shopify-native email + SMS setup at a predictable price, Spoks is built for that.

If you want a longer head-to-head on platform choice, we've written a Klaviyo review, a Klaviyo pricing breakdown, and a Klaviyo alternatives roundup for Shopify. For Omnisend specifically, see our Omnisend alternatives guide and our MailerLite vs Klaviyo comparison.

FAQ

Is SMS marketing legal in the US? Yes — with consent. The TCPA requires "prior express written consent" before you send marketing SMS via automated technology.³ As long as you collect that consent properly (clear and conspicuous opt-in language, frequency disclosure, message/data rates notice, and STOP instructions) and honor opt-outs immediately, SMS marketing is fully legal. Violating TCPA can cost $500–$1,500 per message under a private right of action.³

How much does SMS marketing cost for a Shopify store? A 5,000-subscriber store sending 4 campaigns + 3 automated flows per month typically spends $300–$400/month total when you include platform fees, per-message carrier costs (~$0.012/SMS average across providers), and 10DLC registration fees. See the cost breakdown section above for the math.

How many texts is too many? Above 6 promotional SMS per month is the common warning line.¹⁰ An unsubscribe rate above 1.5% on a send is the signal you've crossed it.¹⁰ Transactional messages (order updates, back-in-stock alerts the customer asked for) don't count toward this budget.

Do I need 10DLC for my Shopify store? If you're sending SMS to US recipients from a 10-digit local number, yes.⁶ Without 10DLC brand and campaign registration, US carriers will filter, throttle, or block your messages.⁶ Your SMS app handles the registration paperwork, but you provide the EIN and brand details.

Can I import SMS subscribers from another platform? You can import the contact list, but you need documented proof of consent for every subscriber. If you're switching from Klaviyo to a new platform, the consent records should transfer with the export. If you're importing a list that was collected without proper TCPA consent, don't text them. You'll face liability for every send.

Short code or long code for my Shopify store? For nearly all Shopify stores doing under $5M GMV, a 10DLC long code is the right answer. Short codes start at roughly $500/month and run $11,000–$17,000/year — overkill unless you're sending hundreds of thousands of messages monthly with strict throughput needs.⁷

Can I send the same campaign by email and SMS? You can, but you shouldn't send identical copy. SMS is a shorter, more urgent channel. The right move: design the email and the SMS as a coordinated pair, where the SMS drives to the email's landing page or to checkout directly. Send the SMS 1–3 hours after the email for a one-two punch on time-sensitive promotions.

What's the best SMS marketing app for Shopify? There isn't a single right answer — it depends on volume, budget, and whether you want bundled or pay-as-you-go SMS pricing. For most stores under 10K contacts that want predictable, flat email pricing with SMS on top, Spoks is competitive. For high-volume DTC brands, Postscript or Attentive are common picks. For Klaviyo users considering alternatives, see our Klaviyo alternative comparison.

Final verdict and next steps

If you're a Shopify store owner who hasn't started SMS yet, here's the short list to do this week:

1. Turn on Shopify's native SMS consent at checkout (Settings → Checkout → Marketing options → SMS). This costs you nothing and starts building a list immediately.⁴
2. Pick an SMS-capable app that matches your volume and pricing preference. The comparison table above covers the major options.
3. Complete 10DLC brand + campaign registration through your chosen app. Expect 1–3 weeks for approval.⁶
4. Set up the 5 core flows before any campaign sends: welcome, abandoned cart, post-purchase, back-in-stock, win-back.
5. Send your first campaign to a 10% test segment. Watch the opt-out rate. If it's under 1%, roll out to the rest. If it's above 1.5%, reconsider the send.
6. Limit promotional frequency to 2–4 sends per month for the first 90 days. Earn the right to send more by demonstrating low unsubscribes and strong revenue per send.

SMS done well is one of the highest-ROI channels in ecommerce. SMS done badly burns your list in two weeks. The difference is consent quality, frequency discipline, and message relevance — not the app you use.

If you want flat-rate email plus SMS for a Shopify store without the contact-tier pricing trap, see Spoks pricing. If you want to compare against the dominant incumbent, our Klaviyo alternative breakdown is the place to start.

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Sources

Footnotes

1. Sender.net, "SMS Marketing Open Rate Statistics (2026)," and Rally Corp, "98% SMS Open Rates Are a Myth" — multiple analyses agree the 98% figure is widely cited but should be treated as a behavioral benchmark, not a precisely measured stat. Verified May 18, 2026. https://www.sender.net/blog/sms-open-rates/ ; https://blog.rallycorp.com/90-sms-open-rates-are-a-myth/ ↩ ↩²

2. SMS ecommerce benchmarks compiled across Postscript ("SMS Marketing Benchmarks for Ecommerce Brands"), Omnisend ("SMS Marketing Conversion Rate: Benchmarks"), AudienceTap ("SMS Marketing Statistics for Ecommerce (2026)"), and Klaviyo's published 2026 SMS benchmarks. Verified May 18, 2026. https://postscript.io/blog/sms-marketing-benchmarks-what-good-performance-looks-like-in-2026 ; https://www.klaviyo.com/products/sms-marketing/benchmarks ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

3. FCC, "Telemarketing and Robocalls" page and the FCC's One-to-One Consent Rule PDF (https://docs.fcc.gov/public/attachments/DOC-408396A1.pdf); summary of TCPA penalties (statutory damages of $500–$1,500/violation, private right of action) verified via BCLP Law analysis of FCC TCPA opt-out rules effective April 11, 2025. Verified May 18, 2026. https://www.bclplaw.com/en-US/events-insights-news/the-tcpas-new-opt-out-rules-take-effect-on-april-11-2025-what-does-this-mean-for-businesses.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

4. Shopify, "Collecting customer contact information," and Shopify Changelog entries on SMS marketing consent at checkout. Includes the cited "60% of marketing consent collected at checkout" Shopify-published figure. Verified May 18, 2026. https://help.shopify.com/en/manual/promoting-marketing/create-marketing/customer-contact-information ; https://changelog.shopify.com/posts/capture-sms-marketing-consent-in-shopify ↩ ↩² ↩³ ↩⁴

5. CTIA, "Messaging Principles and Best Practices" (May 2023 PDF), via api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf. Note: ctia.org is JavaScript-rendered; the PDF is the authoritative version. Verified May 18, 2026. ↩ ↩² ↩³ ↩⁴

6. Twilio Help Center, "What is A2P 10DLC?" and SignalWire's beginner guide to A2P 10DLC campaign registration. Verified May 18, 2026. https://help.twilio.com/articles/1260800720410-What-is-A2P-10DLC- ; https://signalwire.com/blogs/industry/a-beginners-guide-to-a2p-10dlc-campaign-registration ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

7. Sinch, "Long code vs. short code texting: The complete guide to SMS," and corroborating data from Rejoiner and Omnisend. Throughput figures (1–75 MPS for long codes, up to 400 MPS for short codes) and cost ranges ($500+/mo, $11K–$17K/year for short codes) cross-referenced. Verified May 18, 2026. https://sinch.com/blog/long-code-vs-short-code/ ↩ ↩² ↩³ ↩⁴ ↩⁵

8. Twilio Messaging Pricing pages — twilio.com/en-us/pricing/messaging and twilio.com/en-us/sms/pricing/us. Note: direct fetch of twilio.com/sms/pricing/us was blocked (redirect cancelled); rates ($0.0079+/SMS, $1.15/mo local number, $2.15/mo toll-free) confirmed via Twilio Help Center pricing articles and AutomationAtlas's 2026 Twilio pricing analysis. Verified May 18, 2026. https://www.twilio.com/en-us/pricing/messaging ↩ ↩² ↩³

9. ActiveProspect, "TCPA text messages: Rules and regulations guide for 2026," and Privacy World, "New Class Action Threat: TCPA Quiet Hours and Marketing Messages." Quiet hours of 8 a.m.–9 p.m. recipient local time plus state-specific variations (FL, CT, MD, OK, WA at 8 a.m.–8 p.m.; TX 9 a.m.–9 p.m./noon–9 p.m. Sundays) verified across multiple sources. Verified May 18, 2026. https://activeprospect.com/blog/tcpa-text-messages/ ↩ ↩² ↩³

10. Postscript, "SMS Marketing Benchmarks for Ecommerce Brands"; Mobile Text Alerts, "2025 SMS Marketing Benchmarks with Insights from 15 Experts"; Mailchimp, "SMS Marketing Frequency: What's Too Much?" Consensus on 2–6 promotional SMS/month with 4–6 being upper end; 1.5% unsubscribe threshold as fatigue signal. Verified May 18, 2026. https://postscript.io/blog/sms-marketing-benchmarks-what-good-performance-looks-like-in-2026 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

11. Klaviyo pricing page (klaviyo.com/pricing) — direct fetch returned JS-rendered placeholder; rates ($35/mo Email+SMS starter with 500 contacts + 1,250 SMS credits; $0.0092–$0.012/SMS US) cross-referenced from Klaviyo Help Center article on mobile credits and multiple 2026 pricing analyses. Verified May 18, 2026. https://help.klaviyo.com/hc/en-us/articles/13502982552347 ↩ ↩² ↩³ ↩⁴

12. Postscript pricing page (postscript.io/pricing). Starter plan free with pay-per-message ($0.015/SMS, $0.045/MMS), Growth $25/mo, Professional $500/mo. Carrier fees ~$0.00384 for SMS, $0.00779 for MMS quoted by Postscript. Verified May 18, 2026. https://postscript.io/pricing ↩ ↩² ↩³

13. Spoks pricing page (spoks.com/pricing). $35/month flat for unlimited contacts; all features included; SMS is described on the pricing page as "Pay as you go SMS credits." Page snapshot fetched and verified May 18, 2026. https://spoks.com/pricing ↩ ↩² ↩³ ↩⁴

14. Omnisend, "Omnisend Pricing Plans 2026" Help Center article. New SMS pricing effective May 4, 2026: $0.007+/SMS volume-based for new subscribers; legacy users get SMS credits equivalent to plan price. SMS credits expire after 60 days (one billing cycle of rollover). Verified May 18, 2026. https://support.omnisend.com/en/articles/3533018-omnisend-pricing-plans-2026 ↩ ↩²

15. Attentive pricing — quote-based and not published. Estimates ($500+/mo starting, common quarterly minimums of $2,000–$3,000, per-segment rates $0.01–$0.025) sourced from CheckThat.ai's Attentive Pricing 2026 analysis and ATTN Agency's Attentive Review 2026. Verified May 18, 2026. https://checkthat.ai/brands/attentive/pricing ↩ ↩²

16. Yotpo SMSBump pricing (yotpo.com/pricing and smsbump.com). Plans from free tier through paid tiers starting around $19/mo; per-message rate from $0.0072/SMS plus carrier fees per third-party reviews. Verified May 18, 2026. https://www.yotpo.com/pricing/ ; https://smsbump.com/pages/faq ↩ ↩²