SMS Marketing for Shopify Stores: Rules, Tools and Examples

SMS can be the fastest way for a Shopify store to reach a customer, but it should not become a shorter copy of your email programme. Texts interrupt people more directly, cost far more to send than emails and sit under the UK's Privacy and Electronic Communications Regulations (PECR), so SMS is most useful when a message is timely enough to justify landing on someone's phone now: abandoned baskets, major launches, real restocks and VIP access, not three generic promotions a week.

Having someone's mobile number also does not mean you can text them marketing. You normally need specific SMS consent unless the limited soft opt in applies and all its conditions are met. This guide covers where SMS earns its place, the UK rules, which Shopify SMS tools to consider, the flows worth building and how to tell whether the extra cost is paying off, including what one abandoned cart text added for a Why Matters client. Legal and platform details were checked on 1 October 2026.

Key Takeaways

• SMS works best when speed matters: abandoned baskets, launches, restocks and VIP access, not duplicating every email.
• UK marketing texts fall under PECR, and you generally need consent specific to SMS unless the products and services soft opt in applies in full; email consent does not cover texts.
• Adding one abandoned cart text to a health and beauty client's Klaviyo flow recovered £180 a month on top of what the emails already recovered.
• Texts cost far more than email: Shopify Messaging charges $0.06 per UK text, against $1 for 1,000 extra emails, and long texts split into several billable segments.
• Klaviyo suits stores that want SMS beside their email flows and Shopify data, Shopify Messaging offers native SMS, and dedicated providers suit high volume or API led sending.
• Measure SMS on revenue per recipient, orders, unsubscribes and the extra revenue over email alone, not clicks.

Quick Answer

SMS marketing for a Shopify store means sending promotional texts to customers or subscribers who are legally eligible to receive them. In the UK, PECR generally requires consent specific to texts unless the products and services soft opt in applies. SMS earns its place where speed matters, such as an abandoned basket, a requested restock alert, a major launch or VIP access, and one abandoned cart text recovered an extra £180 a month for one of our clients. Klaviyo and Shopify Messaging both sync Shopify data and automate texts, while dedicated SMS providers suit high volume or API led sending.

Table of Contents

• When Does SMS Work Better Than Email?
• Is SMS Marketing Legal in the UK?
• Which SMS Tool Should a Shopify Store Use?
• How Do You Grow an SMS List?
• Which Flows Are Worth Sending by Text?
• How Often Should You Send Marketing Texts?
• How Do You Measure SMS Revenue?
• Why Matters Perspective
• Frequently Asked Questions
• Final Thoughts
• Related Articles

When Does SMS Work Better Than Email?

Email is better for several product images, detailed explanations, guides, launch stories, multiple links and regular newsletters. SMS is better when the message is short, relevant and time sensitive: a reminder about a basket someone has just left, a restock they asked about, first access to a major launch, VIP early access, or a promotion ending in hours rather than days. The key word for launches is major, because texting every new colour quickly removes the urgency that makes the channel work.

Delivery updates suit texts too, but they are a different category. The ICO says purely administrative service messages are not direct marketing, so Your order will arrive between 2pm and 4pm today is a service text, while adding Buy another now for 20% off turns it into marketing, with all the rules that brings. Keep transactional and marketing texts apart.

Cost is the other reason to be selective. Shopify Messaging charges $0.06 per UK text, while its email pricing includes 10,000 emails a month on eligible plans and then $1 per 1,000. These are one platform's prices rather than industry rates, but they show why the question is not whether SMS gets attention, but whether the extra attention makes enough extra profit.

Is SMS Marketing Legal in the UK?

Yes, SMS marketing is legal in the UK, but you must comply with PECR and UK data protection law. The ICO treats texts as electronic mail, so the starting rule for marketing to individuals is that you need consent unless a soft opt in applies. Consent must be freely given, specific, informed, unambiguous and given by a clear positive action, so a pre ticked box never counts, and the ICO is clear that consent should cover the type of marketing you send: agreeing to marketing emails is not agreeing to marketing texts. A box reading Send me offers and product news by text message is far clearer than Send me marketing.

The products and services soft opt in is a narrow exception. To rely on it, every one of these must be true:

1. You collected the person's details directly.
2. You collected them while selling, or negotiating to sell, a product or service.
3. You only market your own similar products or services.
4. You gave a clear chance to refuse marketing when you collected the details.
5. You give a simple way to opt out in every later message.

It is not they bought from us once, so we can text them. The ICO says negotiating can include someone who actively showed interest in buying, but you still need to know how and why each number was collected and whether an opt out was offered at the time; if in doubt, take legal advice rather than stretching the exception. The soft opt in never covers bought lists, and a supplier calling its data GDPR compliant does not remove your duty to check that the consent names you and covers texts.

Every marketing text needs a working opt out, and once someone opts out you must stop. Klaviyo's default UK branded sender ID cannot receive replies, so it uses an unsubscribe link instead of a STOP reply. The ICO does not set a single legal sending window, but a 3am promotion is never sensible, and Klaviyo recommends quiet hours from roughly 9pm to 8am in the recipient's local time.

Which SMS Tool Should a Shopify Store Use?

There is no single best SMS platform. The choice depends on whether you want SMS tied closely to email and Shopify customer data, or mainly a low cost, flexible messaging gateway:

For stores already on Klaviyo, the big advantage is that behaviour, email and texts live in one system, so SMS steps sit inside the same flows and segments. Klaviyo supports UK SMS with branded sender IDs, collects consent through forms, Smart Opt in and Shopify checkout, and since July 2026 has priced Mobile Messaging per message in dollars; your exact rates are under Settings, Billing, Account Usage, View Text Message rates, and our Klaviyo pricing guide covers the change.

Shopify Messaging, formerly Shopify Email, now lets UK merchants send SMS campaigns and automations for abandoned browse, cart and checkout straight from Shopify, using an alphanumeric sender name, which makes it a credible option for smaller stores. Omnisend combines email, SMS, forms, segmentation and automations like Klaviyo, with SMS pricing from $0.007 in some markets, while The SMS Works is a UK SMS platform and API charging from 4.4p plus VAT per delivered text, with no charge for undelivered ones, that suits high volume senders with developers to handle the integration.

Do not choose on cost per text alone. Compare Shopify data sync, consent capture and separation from email, UK sender IDs, automation triggers, segmentation, attribution, opt out handling, segment charges, carrier fees, monthly minimums and support, because the cheapest gateway is rarely the cheapest system to run, and moving your whole retention stack to save a fraction of a penny per text can be a false economy.

How Do You Grow an SMS List?

Grow an SMS list more deliberately than an email list. Shopify checkout can show a separate SMS marketing opt in, which cannot be preselected, and Klaviyo can sync that consent through its Shopify integration. Entering a phone number for delivery is not the same as agreeing to marketing texts.

On sign up forms, keep SMS as its own step rather than hiding it in one vague consent line, which is what Klaviyo recommends when collecting both channels:

Your email list is one of the best sources of SMS subscribers, but ask them to join rather than copying their numbers across, and give a reason beyond another discount: first access to launches, restock alerts, VIP access or limited drops keep people subscribed after the welcome code is used. Never import numbers just because they sit in Shopify, your courier system, customer service records or an old platform, until you know the legal basis and evidence for texting them.

Which Flows Are Worth Sending by Text?

Abandoned cart or checkout is usually the first marketing text worth testing, because the customer has already shown intent. A message such as Still thinking it over? Your basket is saved here: [link]. Opt out: [link] does the job without repeating the product page. For one Why Matters health and beauty client, adding a single abandoned cart text to the Klaviyo flow recovered £180 a month on top of what the emails already recovered.

• Back in stock: ideal when the customer asked for the alert and the product sells fast; skip anyone who already bought after joining the waitlist.
• VIP or early access: VIP access to our new collection is live now is more defensible than texting the whole list every time a sale starts.
• Replenishment: only time it to how quickly customers actually run out, not a guess.
• Shipping and delivery: service texts that should stay free of promotions.

Keep long content in email: educational sequences, founder letters, detailed comparisons, large gift guides and multi product newsletters. A text should lead somewhere, not try to hold the whole customer journey in 160 characters; see our guide to email marketing campaigns for what belongs there.

How Often Should You Send Marketing Texts?

There is no legal limit on how many promotional texts a UK store can send, so frequency is a customer and commercial decision, and a sensible rule is to send fewer texts than emails. For many brands, one or two well chosen marketing texts a month beats a fixed weekly slot, with more during a major launch, Black Friday or a genuine flash sale. Segment rather than broadcast: a restock text to the waitlist, a VIP launch to VIPs and a replenishment reminder to people due to reorder means no one receives every message.

Watch your unsubscribe rate, which Klaviyo reports for every SMS campaign and flow; if each send removes a noticeable share of the list, you are sending too often, targeting poorly or duplicating email. Keep texts short, too: a standard SMS holds 160 characters, an emoji or certain special characters cut that to 70, and longer messages are billed as several segments on both Klaviyo and Shopify Messaging. If a text needs four paragraphs, it is an email.

How Do You Measure SMS Revenue?

Do not judge SMS on clicks. Revenue per recipient is attributed SMS revenue divided by recipients, so £3,000 from a text delivered to 2,000 people is £1.50 each, which you can compare with the send cost, other texts and the equivalent email. Track placed orders rather than curiosity, and watch unsubscribes, because a high earning text that drains the list can still be a poor long term decision.

The most useful measure is the extra revenue over email alone. Some customers would have come back without the text, so ask how much more the flow made after adding it, ideally with an A/B test or holdout; that is why our client's result is framed as £180 a month on top of the emails, not the total revenue the text was credited with. Klaviyo's default attribution for new accounts credits texts for five days after a click, one day after supported opens and 12 hours after delivery, and changing those windows changes reported SMS revenue without changing a single real order.

Why Matters Perspective

Disclosure: Why Matters is a Klaviyo Partner. We treat SMS as an extension of retention marketing, not an excuse to send more messages: email still does the heavy lifting wherever a message needs explanation, design or several products, while texts earn their place when being immediate creates commercial value. So our first SMS work for a Shopify store focuses on a few moments, usually abandoned baskets, major launches, restock alerts and VIP access, rather than a big campaign calendar.

Consent comes before automation, so we check how numbers are collected, that email and SMS permissions are separate and that opt outs work before scaling. Then we plan texts alongside the email programme, as with our health and beauty client, where email explains the product and one short text adds the nudge that recovered an extra £180 a month. Our email marketing service covers Klaviyo campaigns, flows, segmentation, SMS, deliverability and reporting, and the question we start with is which customer moments become more valuable when the message arrives immediately.

Frequently Asked Questions

Is SMS marketing legal in the UK?

Yes. Marketing texts fall under PECR and UK data protection law. You generally need specific consent to text individuals unless the products and services soft opt in applies and every one of its conditions is met.

Do I need consent to text customers?

Usually, yes, and it must cover texts specifically, because consent to marketing emails does not automatically cover SMS. The soft opt in only applies where you collected the number during a sale, market your own similar products and offered an opt out then and in every text.

How much does SMS marketing cost?

It depends on the platform, country and message length. Shopify Messaging charges $0.06 per UK text, Klaviyo uses account specific per message dollar rates, and UK providers such as The SMS Works charge from 4.4p plus VAT per delivered text.

Is an abandoned cart text worth adding?

Often, yes. Adding one abandoned cart text to a Why Matters health and beauty client's Klaviyo flow recovered £180 a month on top of what the emails already recovered. Test it against email alone to see the extra revenue.

How often should I send marketing texts?

Less often than email. Start with one or two well targeted texts a month plus a few automated moments, then watch conversion, revenue per recipient and unsubscribes before sending more.

Can I use Klaviyo for SMS?

Yes. Klaviyo supports UK SMS with branded sender IDs, syncs Shopify checkout consent, and lets texts sit beside email in the same flows, segments and reports, priced per message since July 2026.

What should an abandoned cart text say?

Keep it short and useful, such as: Still thinking it over? Your basket is saved here, followed by the link and an opt out. A discount is not needed just because the message is automated.

Final Thoughts

Start smaller than your SMS platform wants you to: one high intent automated text, such as an abandoned basket, and one genuinely time sensitive message, such as a requested restock or VIP launch. Then measure conversion, revenue per recipient, total send cost, unsubscribes and, above all, whether the texts added revenue beyond your emails, as one did for our client.

If those messages work, expand carefully; if they do not, sending more texts will not fix it. And before any of it, make sure the people you are texting have actually given you the right to do so. For help building SMS alongside your Shopify email programme, see our Klaviyo email marketing agency page.

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