How to Block Unwanted Promotional SMS Messages for Good

Few things are more annoying than a phone that buzzes all day with marketing texts you never asked for — sale alerts, loan offers, betting tips, and outright scams. The good news is that you have more control than you might think. Between built-in phone filters, network short codes, and official opt-out services, you can cut promotional SMS down to almost nothing.

Quick Answer

To block unwanted promotional SMS, first reply STOP to the sender where a valid opt-out is offered, then block the number in your Messages app and switch on spam filtering (Google Messages spam protection on Android, or Filter Unknown Senders on iPhone). For UK marketing texts from companies, you can also register with the free Telephone Preference Service and report scam texts free of charge by forwarding them to 7726.

Step 1: Use the STOP Opt-Out

Legitimate marketing messages from real companies usually include an opt-out instruction. Replying with the single word STOP tells their system to remove your number from that campaign list.

1. Open the promotional message.
2. Check the end of the text for opt-out wording such as “Reply STOP to end”.
3. Send STOP and nothing else.
4. Allow up to a few days for the messages from that sender to stop.

Be careful: only use STOP with senders you recognise as genuine businesses. For obvious scam texts, replying confirms your number is active — block and report those instead, without replying.

Step 2: Block the Sender on Your Phone

On Android (Google Messages)

1. Open the conversation.
2. Tap the sender name or the three-dot menu, then choose Block (or “Block and report spam”).
3. Tick “Report spam” for fraudulent messages so Google can improve its filters.

On iPhone

1. Open the conversation and tap the sender’s number or name at the top.
2. Tap Info, then “Block this Caller”.
3. Turn on Settings, then Messages, then “Filter Unknown Senders” so messages from people not in your contacts are separated into their own list.

Step 3: Switch On Built-In Spam Filtering

Modern messaging apps can silently filter most junk before you ever see it. In Google Messages, open Settings and enable “Spam protection” — suspicious texts are moved to a Spam and Blocked folder automatically. Samsung Messages offers a similar caller and spam ID feature powered by Hiya. On iPhone, iOS filters messages from unknown senders when the setting above is on, and recent versions also screen likely spam into a dedicated section.

These filters improve over time as more users report junk, so reporting genuinely helps. The Information Commissioner’s Office guidance on nuisance calls and texts explains your rights and how to complain about companies that ignore opt-outs.

Step 4: Register and Report

In the UK you can register your number with the Telephone Preference Service (TPS), which makes it unlawful for companies to make live marketing calls to you, and reputable firms screen their lists against it for texts too. It is free and takes a couple of minutes online. For scam or phishing texts, forward the message free to 7726 (which spells SPAM on a keypad). Your network uses these reports to block the sender for everyone. Our guide to finding out who contacted you from an unknown number covers the same checking habits for suspicious calls.

Common Mistakes to Avoid

• Clicking links in junk texts. Links in scam SMS often lead to fake bank or delivery pages designed to steal details.
• Replying STOP to obvious scams. It tells criminals the number is live and can increase messages.
• Paying for blocking apps with poor reviews. The free built-in filters handle most cases well.
• Giving your number out loosely. Every competition, form, and checkout that collects your number is a future source of marketing texts — untick the marketing consent boxes.
• Blocking your own bank or delivery firms by accident. Check the spam folder occasionally for genuine messages caught by the filter.

How Marketing Lists Got Your Number in the First Place

Understanding the sources helps you stop the flow rather than just filtering the symptoms. Your number leaks into marketing lists through online purchases where the marketing consent box was pre-ticked, competitions and prize draws whose real prize is your data, comparison and voucher sites, loyalty schemes, and old-fashioned data brokers who buy and sell contact lists. Every time you hand over your number, ask whether the service truly needs it, and always untick optional marketing boxes. Using your number only where necessary is the quiet, long-term fix that makes the filters’ job smaller every year.

Extra Protection at Network and App Level

• Network spam filters: several networks now block known spam SMS before delivery when you opt in through their app or account settings — worth switching on.
• Keyword filtering: some messaging apps let you auto-filter messages containing phrases you choose. Use it carefully so genuine messages using similar words are not hidden.
• Separate your numbers: if junk becomes relentless, keep your main number private and use a second SIM or a virtual number for sign-ups, deliveries, and classified ads.
• Review app permissions: apps with SMS access can read verification codes and, in rogue cases, far more. Remove SMS permission from anything that does not genuinely need it.
• Keep reporting: every forward to 7726 trains the network filters that protect everyone, including you next month.

Handling the Stubborn Cases

A small minority of senders ignore opt-outs, filters, and blocks alike. When one company keeps texting after a clear STOP, escalate in writing: complain to the company first and keep screenshots showing dates and message content, then complain to the ICO if the messages continue — regulators fine repeat offenders, and a single detailed complaint genuinely contributes. If the texts are arriving on a work phone, tell your IT department as well, since business accounts have additional network-level blocking options.

Finally, if your number has plainly been circulated for years and the volume never drops below a daily nuisance, a number change is the nuclear option — free from most networks, though it means updating your number everywhere it is registered. Most people never need it once the steps in this guide are in place, but it is reassuring to know the reset button exists.

Conclusion

You do not have to live with a noisy inbox. Opt out with STOP for genuine companies, block persistent senders, turn on your phone’s spam filter, register with the TPS, and forward scams to 7726. Combined, these steps reduce promotional and fraudulent SMS to the occasional stray — and your spam folder quietly handles the rest.

Frequently Asked Questions

Is it safe to reply STOP to a marketing text?

It is safe for messages from recognisable, legitimate companies, and it is the fastest way off their list. For suspicious texts from random numbers, do not reply — block the sender and forward the message to 7726 instead.

Why do I still get promotional texts after blocking?

Many campaigns send from rotating numbers or name-based sender IDs, so blocking one number does not block the campaign. Spam filtering plus STOP opt-outs and TPS registration attack the problem at the source.

Does forwarding a text to 7726 cost anything?

No. Forwarding spam texts to 7726 is free on UK networks, and your network may reply asking for the sender’s number so it can block them.

Can I block texts from a sender name instead of a number?

On Android with Google Messages you can block the conversation even when the sender shows a name, and spam protection filters many of them automatically. On iPhone, Filter Unknown Senders separates them from your main inbox.

Will blocking SMS also block verification codes?

Only if you block the specific sender that sends them. Filters are designed to let short-code service messages through, but if a code goes missing, check your Spam and Blocked folder before requesting another.