SMS works in the UK when three things line up: the message is urgent or time-bound, the recipient expects to hear from you, and the text is short enough to read in a glance. It works badly when it is used as a cheaper newsletter. This page looks at where texts pay off for British organisations, how to measure them honestly, and the limits PECR puts on the channel.
The reach is not in doubt
Almost everyone in the UK carries a phone. DataReportal’s Digital 2026 report counted 99.3 million active cellular mobile connections in the UK in late 2025, equivalent to 143% of the population, because many people carry a work phone or a second SIM. Texts reach any of those phones, smartphone or not, without an app, a data connection or an inbox filter deciding whether the message is promotional.
Where SMS clearly beats email
- Reminders that prevent no-shows. Dentists, driving instructors, beauty salons and MOT garages send a text the day before because a missed appointment costs more than the message.
- Delivery and collection updates. Couriers and retailers text because people check their phone when they are waiting for something.
- Last-minute availability. A restaurant with cancelled tables on a Saturday, or a theatre with returns, needs an answer in hours, not days.
- Deadlines. The final hours of a Black Friday offer, a charity appeal closing at midnight, or a membership renewal due tomorrow.
Where email is still the better tool
Anything that needs images, several products, a story or links to read later belongs in email. So does anything you send more than a few times a month. Texting too often turns a welcome channel into an intrusion, and a STOP reply loses you the contact for good. Our comparison of texting and email goes deeper, and combining SMS with email campaigns shows how to use each where it is strongest.
Timing texts for a UK audience
A text is read almost as soon as it arrives, so the send time is the experience. Avoid early mornings, late evenings and Sunday mornings for promotional messages. Remember the clocks change on the last Sundays of March and October, and schedule in local time. Mailpro lets you schedule an SMS campaign in advance so a lunchtime offer arrives at lunchtime.
How to judge whether it worked
Open rates don’t exist for SMS, so measure what matters:
- Delivery rate: the share of texts that reached a handset. A low figure usually points to badly formatted +44 numbers or old contacts.
- Click-through: if you include a link, track it with a campaign tag in your analytics.
- Action taken: bookings kept, orders collected, codes redeemed.
- Opt-out rate per send: if it rises, you are texting too often or without enough relevance.
Mailpro’s SMS statistics show delivery per recipient, and the monthly email and SMS report puts both channels side by side. In Mailpro’s own customer survey, users rated SMS deliverability 9.8 out of 10.
The compliance limit on effectiveness
A text sent without valid consent or soft opt-in isn’t effective at any open rate: it is a PECR breach, and since February 2026 the ICO can fine up to £17.5 million or 4% of global turnover. Build your SMS list from customers and supporters who ticked a separate SMS box, include an opt-out in every message, and keep records. Our guide to SMS marketing in the UK covers sender names, number formatting and consent in detail.