How did scammers get my number, and how do I get fewer scam texts?

This question is usually asked with the implication that something was done wrong. Mostly nothing was. Numbers reach criminals through mechanisms that are entirely outside your control, and the most common one requires no information about you at all.

Step by step

1. Understand the four routes.A breach of a company you dealt with. Lawful sale or sharing by a company whose consent box you ticked. Public exposure — a listing, a CV, a company registration, a social profile. And sequential dialling, where software works through every number in a UK range and needs to know nothing at all.
2. Check whether your details are in a known breach.Search your email address on a reputable breach-checking service. It will not list phone numbers reliably, but it tells you which companies holding your data have been breached.
3. Register with the Telephone Preference Service.Free, and it makes unsolicited live marketing calls unlawful to your number. It has no effect on criminals, who are already breaking the law, but it removes a large slice of the legitimate nuisance so the rest stands out.
4. Report every scam text to 7726.Free on every UK network. Forward the message and reply with the sender's number when asked. This is what feeds network-level blocking, and it works at scale even though you never hear back.
5. Turn on the filtering already in your phone.Both major phone platforms can silence calls from unknown numbers and sort messages from unknown senders into a separate list. Your network may also offer free call protection — check what is included.
6. Stop giving the number out reflexively.Loyalty schemes, competitions, delivery forms, free Wi-Fi sign-ups, warranty registrations. Where a number is genuinely optional, leave it blank. This does not undo the past, but it stops adding to it.
7. Use a second number for the throwaway cases.A pay-as-you-go SIM, an eSIM line or a calling app number for sales, marketplace listings and sign-ups keeps the main number out of circulation.
8. Do not answer, engage or press keys.Answering and responding confirms a live number, which raises its value on the lists that are traded. Let unknown numbers go to voicemail.

Tips

• There is no way to withdraw a number from circulation once it has been sold on. Changing the number works but costs you everything attached to it, and is usually only worth it in cases of harassment.
• A spike after a purchase, a house move or a competition entry is worth noticing — it usually points at exactly one company, and you can ask them what they did with your data.
• Scam calls showing a number similar to your own are using neighbour spoofing to look local. The similarity is generated, not meaningful.

Common mistakes

• Replying STOP to a scam text — STOP is a legal requirement for genuine UK marketing. To a criminal it simply confirms a real person reads that number.
• Assuming registering with a preference service stops scam calls — It stops lawful marketing. Criminals ignore it entirely, which is why the calls that remain after registering are more likely to be fraudulent.
• Blocking numbers one at a time — Numbers are spoofed and disposable, so blocking is endless. Filtering by category and reporting to 7726 are the measures that scale.

Questions people ask