SMS Marketing for Stores: Compliance, Timing and Templates

Why SMS earns a place next to email

Text messages get read, and read quickly; most are opened within minutes of arriving, which no other owned channel can claim. That immediacy makes SMS the right tool for a narrow set of jobs: product drops, restocks, flash offers with genuine deadlines and abandoned-checkout nudges. It is the wrong tool for newsletters, brand storytelling or anything that can comfortably wait a day.

The other difference from email is that every message costs money, typically a few pence per send. That sounds trivial until you multiply it across a list and a year, and it is actually a healthy constraint: SMS punishes lazy broadcasting and rewards stores that treat the channel as a scarce resource reserved for their most engaged customers.

PECR consent: get this right first

Marketing texts in the UK are governed by the Privacy and Electronic Communications Regulations (PECR) alongside UK GDPR. The default position is that you need consent before sending: a specific, informed, freely given opt-in signalled by a positive action. Pre-ticked boxes do not count, consent buried in terms and conditions does not count, and you must keep records of when and how each person opted in.

The soft opt-in exception

You may text existing customers without a fresh opt-in if all three conditions hold: you collected their details during a sale or sale negotiations, you are marketing your own similar products or services, and you gave a clear chance to refuse at the point of collection and in every message since. Miss any one condition and the exemption falls away entirely.

The ICO actively enforces against spam texts. Penalties for PECR breaches have historically run up to £500,000, and legislation passed in 2025 raised the maximum penalties substantially, so the cost of getting this wrong is rising. Beyond fines, every message must identify your business and carry a working opt-out, usually reply STOP.

Building a list that's worth texting

A small list of genuine opt-ins outperforms a large list of grudging ones, and it costs less to message. Build it deliberately:

• Add an unticked SMS checkbox at checkout with plain wording about what you will send and roughly how often
• Offer a reason to join beyond a discount: early access to drops and restock priority convert well and attract better subscribers
• Use keyword sign-ups on packaging inserts and social bios, for example texting a word to a shortcode
• Never buy or rent a list; consent is not transferable and the ICO treats bought lists as a red flag
• Sync opt-outs instantly across every tool you use; STOP handling is automatic within platforms such as Klaviyo, Yotpo SMSBump, Attentive and Omnisend, but only within each one

Timing and frequency

UK law does not set permitted hours for marketing texts, but decency and unsubscribe rates do. Keep sends between roughly 9am and 8pm, avoid early weekend mornings, and set quiet hours in your platform so automations cannot fire at 3am. The UK's single time zone makes this easier than it is for sellers spanning continents, and your own data will refine it further: platforms report opt-out spikes by send time clearly enough to learn from.

On frequency, two to six campaigns a month suits most stores. SMS fatigue is expensive twice over: an opt-out is permanent, and you paid for the message that caused it. Reserve the channel for genuinely time-sensitive moments and let email carry everything else. For restocks specifically, speed matters most; interest decays quickly once an item returns, so trigger restock messages as soon as inventory syncs rather than batching them for a convenient send slot.

Templates for drops, restocks and recovery

Keep messages under about 160 characters where you can, because longer texts split into multiple billed segments. Include your brand name, one link and the opt-out. Adapt these to your own voice:

• Drop: [Brand]: The new collection is live. You get 2 hours before we post it anywhere else: [link] Reply STOP to opt out
• Restock: [Brand]: Back in stock: [product]. It sold out fast last time, so grab yours: [link] STOP to opt out
• Abandoned checkout: [Brand]: Your basket's still here, [Name]. Checkout takes 30 seconds: [link] STOP to opt out
• VIP early access: [Brand]: VIPs only: tomorrow's sale is open for you now. Code VIP10 at checkout: [link] STOP to opt out
• Waitlist alert: [Brand]: Good news, the [product] you wanted is back. Waitlist members get first pick until 8pm: [link] STOP to opt out

Only promise scarcity that is true. If the early access window does not really close, do not say it does; fake deadlines breach consumer protection rules, and customers remember being played.

Costs and honest ROI

Expect to pay a few pence per message segment on mainstream platforms, with exact rates varying by provider and volume. The maths is simple enough to run before every campaign. Suppose 2,000 subscribers at 4p per send: £80 per campaign. If your average order contributes £25 in margin, you need four attributed orders, a 0.2% conversion rate, just to break even. That is a realistic bar for an engaged list receiving a genuine drop or restock, and an unrealistic one for a cold list receiving a generic discount.

• Attribute properly with unique discount codes or UTM-tagged links for every campaign
• Measure revenue per recipient, not opens, which SMS cannot report reliably anyway
• Count the cost of unsubscribes: each opt-out is future revenue you can no longer reach
• Occasionally run the same offer by email to a holdout group and compare; if email matches SMS, save the pence

Used sparingly, with consent handled properly, SMS is one of the highest-leverage channels a small store can run. If you want help setting up compliant sign-up flows and automations, our team at Thind Global Services does this alongside email and WhatsApp marketing.