SMS marketing agency for ecommerce, built on Klaviyo SMS.
We are an SMS marketing agency for ecommerce brands, and we build on Klaviyo SMS. Our SMS marketing services cover the whole channel: a verified sending number, consent you can prove, SMS flows and campaigns, and reporting that puts SMS revenue next to what the texts cost. Most brands either ignore SMS or overuse it until customers opt out. We run it inside Klaviyo, next to your email, so every message goes out on the channel that fits it.
/ Includes
- Klaviyo SMS setup and carrier registration
- Compliant opt-in flows (TCPA-compliant double opt-in)
- SMS welcome series integrated with email flows
- Abandoned cart SMS follow-up sequences
- BFCM and campaign SMS sends
- Conversational SMS for post-purchase engagement
- SMS + email revenue attribution reporting
- List segmentation to prevent overmessaging
- Attentive and Postscript to Klaviyo SMS migration
/ Free Audit
Get your free Klaviyo SMS audit
Drop your store URL and email. We'll review your Klaviyo email and SMS setup and send a written 90-day roadmap within 24 hours. No obligation.
Trusted by
800+ brands
Klaviyo SMS marketing that complements email.
Most SMS programs are bolted on. A second platform, a second set of flows, a second attribution model, and a customer who gets an email and a text about the same abandoned cart ten minutes apart. That is drag, not lift.
We run SMS inside Klaviyo, next to your email. One profile, one flow builder, one revenue number. Every trigger gets one decision: does this belong in the inbox, or is it urgent enough to buzz a phone? Restocks, launches, and deadlines earn a text. Everything else is an email.
The playbook for splitting the two channels is in our guide to running email and SMS in Klaviyo without annoying your customers.
For the platform side, see our guide to Klaviyo SMS marketing setup, flows and consent, what texts actually cost in Klaviyo SMS pricing, and how the options stack up in the best SMS marketing platforms for ecommerce.
SMS marketing services.
Six jobs. Most agencies skip three. Plenty of SMS marketing companies will write texts. Fewer will register your number properly, record consent you can defend, and tell you when the channel is not paying for itself. Comparing agencies? Our ranking of the best SMS marketing agencies shows who fits which brand, ourselves included.
01
Setup and sender registration
Klaviyo SMS switched on properly: sending number chosen for your volume, verification submitted with the details carriers ask for, quiet hours set, and opt-out keywords tested before the first send.
02
Consent capture
Sign-up forms and keyword opt-ins with consent language that matches where you send. Consent is recorded on the profile so you can prove it later, not reconstruct it.
03
Flows that share one profile
Welcome, abandoned checkout, browse, post-purchase, and win-back built so SMS and email take turns instead of stacking. One trigger, one decision about which channel carries it.
04
Campaigns with a frequency ceiling
SMS campaigns planned in the same calendar as email and sent to segments that earned them. A text is a tap on the shoulder. Use it for launches, restocks, and deadlines, not newsletters.
05
Attribution you can trust
SMS and email revenue reported side by side, with what the texts cost against it. If the channel is not paying for itself, you will see it in the report before we tell you.
06
Opt-out control
Opt-out rate tracked per send. When it climbs, we cut frequency or tighten the segment. Every unsubscribe is a phone number you paid to acquire.
What Klaviyo SMS costs.
The texts and the team. How much does it cost to do SMS marketing? You pay your platform for every text you send, and you pay whoever runs the channel. Here are both, as of October 2026.
How much does Klaviyo charge for SMS?
Klaviyo sells SMS as a monthly mobile messaging plan, priced in dollars. It moved from credits to per-message dollar rates in July 2026, with carrier fees built into the rate. For US numbers, as of October 2026, its pricing calculator shows $15 a month for 1,000 texts from a toll-free number, $125 for 10,000, and $240 for 20,000. That is roughly 1.2 to 1.5 cents a text, all in. The plan sits on top of your Klaviyo email plan, and the free plan includes $5 of mobile messages a month.
Three things move the bill. Length: texts are billed per segment of 160 characters, or 70 if the text contains an emoji or special character, so one emoji turns a 100-character text into two segments. Country: 10,000 Australian texts cost $250 a month, as of October 2026. Sending number: a short code has a lower per-text rate (10,000 US texts for $115, as of October 2026) but needs a paid plan and a separate monthly short code fee. Unused plan spend does not roll over, so we size the plan to the calendar.
MMS, the old credit system, and how Klaviyo compares with Postscript are in our guide to Klaviyo SMS pricing.
What our SMS marketing services cost
Klaviyo bills the texts to your account. Our fee covers the work, and we do not bill by the hour. The SMS audit is free and comes back as a written roadmap within 24 hours. A Klaviyo SMS setup, or a migration from Attentive or Postscript, is a fixed-scope project at $3-15K USD depending on scope. Ongoing management of email and SMS together is a monthly retainer, typically $3-12K USD a month for ecommerce brands, scoped to your volume, built for brands at $500K+ annual revenue, and month-to-month with 30-day notice. Published ranges are in USD. See our pricing.
Sources: Klaviyo pricing, Klaviyo's mobile messaging system, Klaviyo's July 2026 mobile messaging billing update, Klaviyo SMS sending numbers.
Attentive or Postscript to Klaviyo SMS: keep, or consolidate.
Attentive and Postscript are good SMS-first platforms. Their SMS depth is real. The cost is a two-platform stack: separate dashboards, separate flows, and two tools both claiming the same order.
We build on Klaviyo and Omnisend, so we do not run Attentive or Postscript accounts. What we do is look at how much of your retention revenue SMS actually drives, and tell you whether consolidating into Klaviyo SMS makes sense. If SMS is your dominant channel, the specialist can be worth it, and we will say so.
Side-by-side detail: Klaviyo vs Attentive and Klaviyo vs Postscript.
Running both for now? Our Klaviyo Attentive integration guide covers how the sync works, and Postscript pricing breaks down plans and carrier fees. Comparing agencies instead? See the best SMS marketing agencies.
Migration to Klaviyo SMS
- Consent moves with the subscriber. SMS opt-in records transfer with their consent history intact.
- Sending number. Your number is moved or replaced, and the new sender is verified before any send.
- Flows rebuilt, not copied. SMS flows are rebuilt in Klaviyo next to the matching email flows, so the channels take turns.
- Timeline. 2 to 4 weeks for most brands, as a standalone project or part of a wider Klaviyo engagement. Moving a US short code takes Klaviyo 4 to 6 weeks once it submits the transfer, so that starts first.
SMS compliance: TCPA, Spam Act, PECR.
Is SMS marketing legal in the USA? Yes, with consent. Texting customers is legal in the US when they agreed to it in writing, you send inside the allowed hours, opt-outs work, and your number is verified with the carriers. Miss one and the bill is counted per text: the TCPA sets statutory damages at $500 per violation, up to $1,500 if willful. Email mistakes cost you inbox placement. SMS mistakes can cost you a lawsuit. The US rules come first below, then Australia's Spam Act 2003 and the UK's PECR.
01
Express written consent
Under the FCC's TCPA rules, marketing texts sent with an autodialer need prior express written consent: a signed agreement that names the number, authorises automated marketing texts, and says consent is not a condition of purchase. The signature can be electronic, which is what makes a sign-up form or keyword opt-in work. A number collected for shipping updates does not count. For cart reminders, US carriers allow one text per abandoned cart, sent within 48 hours, to subscribers who double opted in and agreed to cart reminders.
02
Quiet hours
Federal rules bar telephone solicitations, texts included, before 8am or after 9pm in the recipient's local time. Some states are stricter; Florida, for example, stops at 8pm. Klaviyo's quiet hours hold texts outside the window and can apply state rules by phone area code. We set them to the tightest window your list needs.
03
STOP and HELP
Since April 2025, FCC rules treat a reply of stop, quit, end, revoke, opt out, cancel, or unsubscribe as revoked consent, along with any wording a reasonable person would read as a request to stop. You have 10 business days at most, and one confirmation text with no marketing in it. Carriers also expect HELP to work. Klaviyo unsubscribes STOP replies and answers HELP with your brand name and a contact email automatically; we test both on a live number before the first send.
04
Carrier registration
US carriers check who is texting before they trust the traffic, so the sending number is verified or approved before the first send. Klaviyo supports two US sender types: a toll-free number, the free default, and a short code, the paid upgrade for volume. Klaviyo suggests a short code once campaigns go to more than 30,000 people. It does not offer US long codes, so 10DLC registration only applies if you text from another platform.
| US sending number | In Klaviyo | Cost | Approval |
|---|---|---|---|
| Toll-free number | Yes, the default for the US and Canada | Included | Verification, about 2 to 5 business days |
| Short code | Yes, on a paid plan | Monthly short code fee on top of your plan | About 8 to 12 weeks for a new US short code, 4 to 6 weeks to move an existing one, counted from when Klaviyo submits it to carriers |
| 10DLC long code | Not offered for the US | Not applicable | Only relevant if you text from another platform |
This is how we set programs up, not legal advice. Your own legal adviser should sign off on consent language. Sources: 47 CFR 64.1200 (consent, quiet hours, opt-outs), FCC consent revocation rules, 47 U.S.C. 227 (damages), CTIA Messaging Principles and Best Practices, Klaviyo US sending numbers, Klaviyo short code application reference, Klaviyo text message settings, Klaviyo US cart abandonment SMS rules. The longer version is our SMS compliance guide to TCPA, 10DLC, quiet hours and opt-outs.
SMS consent rules in Australia and the UK.
Australia
Spam Act 2003
- Marketing SMS counts as a commercial electronic message. You need express or inferred consent.
- Every message must identify your business and how to contact you.
- Every message needs a working unsubscribe, and opt-outs must be actioned within 5 working days.
United Kingdom
PECR
- Marketing texts to individuals need specific consent.
- The soft opt-in exception covers existing customers who bought, or negotiated to buy, similar products from you.
- Soft opt-in only holds if you offered a simple opt-out when you collected the number and in every message since.
This is how we set programs up, not legal advice. Your own legal adviser should sign off on consent language for your markets. Sources: business.gov.au on the Spam Act, ICO guide to PECR. Australian and UK detail, including Australia's SMS Sender ID Register, is in our SMS compliance guide.
Email and SMS receipts: Relaxium and Popl.
Email and SMS, measured together. Two named brands, one number each, and how it was earned.
CASE FILE · RELAXIUM
Relaxium
+$3M
Incremental annual revenue from email & SMS
Pete Devkota ran email and SMS for 22+ months as embedded Head of Retention Marketing at the INC 5000 supplement brand. Campaign-led: cadence, segmentation depth and sends planned in step with paid, retail and brand calendars.
CASE FILE · POPL
Popl
50-60%
Revenue from email & SMS (was <20%)
Deliverability fixed first, then separate B2B and B2C journeys, segmentation routing and daily, weekly and monthly calendars, over a 21-month engagement with the Y Combinator-backed brand.
/ Other services
What clients radio in.
Verbatim.
Real results from real brands, in their own words. Auto-scrolling because there are too many to fit.
Questions about Klaviyo SMS marketing.
Q.01 What does an SMS marketing agency do for an ecommerce brand? +
Answer
An SMS marketing agency sets up your text message program, collects compliant consent, builds automated SMS flows such as welcome and abandoned cart, plans and sends SMS campaigns, and reports on the revenue against the cost of sending. We do this inside Klaviyo, so SMS and email share one customer profile, one flow builder, and one attribution model, and the two channels stop competing for the same moment.
Q.02 How much does an SMS marketing agency cost? +
Answer
Our SMS audit is free and comes back as a written roadmap within 24 hours. Fixed-scope work such as a Klaviyo SMS setup or a migration runs as a project engagement at $3-15K USD depending on scope. Ongoing management of email and SMS together is a monthly retainer, typically $3-12K USD a month for ecommerce brands, scoped to your volume and month-to-month with 30-day notice. Published ranges are in USD. Separately, you pay Klaviyo directly for the texts through a monthly mobile messaging plan, carrier fees included; that cost sits on your Klaviyo bill, not ours.
Q.03 How much does it cost to do SMS marketing? +
Answer
Two costs: the texts and the team. On Klaviyo, as of October 2026, US texts cost $15 a month for 1,000 sent from a toll-free number and $125 for 10,000, with carrier fees included, on top of your email plan. Long messages, emojis, MMS, and international numbers cost more. The team is the second cost: with us, the SMS audit is free, a setup or migration is a fixed-scope project at $3-15K USD depending on scope, and ongoing email and SMS management is a monthly retainer, typically $3-12K USD a month, scoped to your volume.
Q.04 How much does Klaviyo charge for SMS? +
Answer
Klaviyo sells SMS as a monthly mobile messaging plan priced in dollars, with carrier fees included. As of October 2026, its pricing calculator shows US toll-free plans at $15 a month for 1,000 texts, $70 for 5,000, $125 for 10,000, and $240 for 20,000. A short code has a lower per-text rate (10,000 texts for $115, also as of October 2026) but needs a paid plan and a monthly short code fee. Each send costs the rate times recipients times message segments, and a segment is 160 characters, or 70 if the text contains an emoji or special character. The free plan includes $5 of mobile messages a month, and unused plan spend does not roll over.
Q.05 Is Klaviyo SMS marketing good enough, or do we need Attentive or Postscript? +
Answer
For most ecommerce brands, Klaviyo SMS is enough and the unified stack wins, because one profile and one attribution model beat two platforms that have to be synced. Attentive and Postscript are SMS specialists with deeper SMS features. If SMS is your dominant retention channel, a specialist can be worth the overhead. The audit looks at how much revenue SMS drives today and gives you an honest recommendation either way.
Q.06 Can you migrate us from Attentive or Postscript to Klaviyo SMS? +
Answer
Yes. The migration moves your SMS subscribers with their consent records, replaces or moves your sending number, and rebuilds your SMS flows and templates in Klaviyo alongside your email. For most brands it runs 2 to 4 weeks. If you are bringing a US short code with you, Klaviyo puts the carrier transfer at 4 to 6 weeks from when it submits the application, so that starts first. It can be scoped as a standalone project or folded into a wider Klaviyo engagement.
Q.07 Do you manage Attentive or Postscript accounts? +
Answer
No. We build on Klaviyo and Omnisend, and SMS runs inside whichever of the two carries your email. If staying on Attentive or Postscript is the right call for your brand, we will tell you, and we can keep your Klaviyo email program coordinated with it so the two channels do not double up on the same customer.
Q.08 Is SMS marketing legal in the USA? +
Answer
Yes, with consent. Under the TCPA and the FCC's rules, marketing texts sent with an autodialer need the recipient's prior express written consent, and consent cannot be a condition of purchase. You also have to send between 8am and 9pm in the recipient's time zone (some states, such as Florida, stop at 8pm), honour STOP and other opt-out replies within 10 business days at most, and text from a number the carriers have verified or approved. Statutory damages are $500 per violation, up to $1,500 if willful. This is general information, not legal advice.
Q.09 What do we need before sending marketing texts in the US? +
Answer
Prior express written consent from each subscriber for automated marketing texts, a verified sending number, and opt-out handling. In Klaviyo, the default US sender is a toll-free number, which must be verified before you send (Klaviyo quotes roughly 2 to 5 business days). A short code is the paid alternative; a new US short code takes about 8 to 12 weeks once Klaviyo submits the application to carriers. Klaviyo does not offer US long codes, so A2P 10DLC registration only applies on platforms that send from ordinary 10-digit numbers. Treat 8am to 9pm in the recipient's local time as the federal window for marketing texts; some states set a tighter one. This is general information, not legal advice.
Q.10 Can we send SMS marketing to customers in Australia and the UK? +
Answer
Yes, under local rules. In Australia, the Spam Act 2003 treats marketing SMS as commercial electronic messages: you need express or inferred consent, must identify your business, and must include a working unsubscribe that is actioned within 5 working days. In the UK, PECR requires specific consent for marketing texts to individuals, with a limited soft opt-in for existing customers who bought similar products and were offered an opt-out at collection and in every message. Check your consent language with your own legal adviser.
Q.11 How often should an ecommerce brand send SMS? +
Answer
Less often than email. Our working guidance is 4 to 6 SMS campaigns a month for most ecommerce brands, with flows on top and transactional texts outside that budget. Watch opt-out rate per send; when it climbs, the frequency or the segment is wrong. SMS earns its place on urgency: launches, restocks, deadlines.
Q.12 What is the difference between SMS marketing services and an SMS marketing platform? +
Answer
A platform (Klaviyo, Attentive, Postscript) is the software that sends texts. A service or agency is the team that decides what to send, to whom, and when, then builds and runs it. Many brands buy the platform and never get the strategy. We do not sell a platform. We run Klaviyo SMS marketing for you.
Get a free Klaviyo SMS audit.
We'll review your email and SMS setup, consent capture and costs, and show you what's missing.
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Get your free Klaviyo SMS audit
Drop your store URL and email. We'll review your Klaviyo email and SMS setup and send a written 90-day roadmap within 24 hours. No obligation.