How to turn on No Caller ID (withhold your number) UK

Turning on No Caller ID means stopping your own number from showing on the screen of the person you call — the opposite of trying to unmask a withheld caller. In the UK this is done with the 141 prefix, a permanent line setting, or a handset toggle. This guide covers every method, the cases where it quietly fails, and the question people ask most: does 141 still work in 2026? (Short answer: yes.)

#Dial 141 to withhold your number (per call)

The simplest way to make one call show as No Caller ID (or Withheld / Private) is to dial 141 directly before the number, with no spaces:

141 020 7946 0000
141 07700 900123

This sets the Presentation Restriction flag on the call. Your network still passes the underlying number across the network for billing, regulation and lawful trace — 141 only suppresses it from the recipient's display. It is free, applies to that one call only, and resets to your normal setting afterwards.

#Does 141 still work?

Yes. 141 still works on every UK network in 2026 — BT, Sky, Virgin Media and TalkTalk landlines, and EE, O2, Vodafone and Three mobiles. It is a core part of the UK numbering plan, not a provider add-on, so it cannot be quietly switched off the way a free trial might be.

The recent wave of CLI authentication work (Ofcom's programme to stop scammers spoofing UK numbers) sometimes gets confused with 141. They are unrelated: CLI authentication checks whether a *displayed* number is legitimately allocated, while 141 simply asks the network *not to display* your number at all. Withholding your CLI is still completely legal and supported.

#Turn No Caller ID on for every call

If you want every outgoing call withheld by default, you have two routes:

1. Ask your provider to set permanent Presentation Restriction (also called 'withhold number' or 'anonymous calling') on the line. Free on most landline and mobile plans; takes effect within a day or so.
2. Use the handset toggle below, which sets the same flag from your phone's settings without contacting the network.

With permanent withholding on, remember the 1470 prefix above to reveal your number for the occasional call that needs it (banks, deliveries, anything that rejects anonymous callers).

#iPhone and Android settings

Most people prefer the built-in toggle. The exact path depends on whether your network exposes the setting to the handset — some UK networks have removed the iPhone toggle, in which case 141 is the fallback.

#When 141 won't hide your number

Withholding has deliberate exceptions. Don't rely on 141 in these cases:

• 999 and 112 emergency calls — your number and location are always passed. This is a safety requirement and cannot be overridden.
• Many 0800 / 0808 / 084 / 087 numbers — because the *called* party pays for these calls, their system can often capture your CLI for billing even when you dial 141. Treat freephone and revenue-share numbers as able to see you.
• Calls to organisations with CLI override — certain regulated services (some helplines, network operators) are permitted to receive a withheld CLI.
• Some VoIP and overseas routes — the 141 flag can be stripped or ignored once a call leaves the UK PSTN, so withholding is not guaranteed end-to-end.

#The person you call can still reject you

Turning on No Caller ID can backfire: many people now run Anonymous Call Rejection or Silence Unknown Callers, which intercept withheld calls before they ring. If your withheld calls keep failing, that's usually why — the recipient is filtering anonymous CLIs, not blocking you specifically. Our guide to the receiving side, withheld 'No Caller ID' calls in the UK, explains exactly what they're seeing and how 1572 works.

And if your goal is the reverse — stopping unknown or withheld numbers from reaching *you* — see how to block spam calls on UK mobiles and landlines and how to block a number on a UK home phone.

#Bottom line

141 is the universal, free way to turn on No Caller ID for a single UK call, and it still works in 2026. For every-call withholding, set it permanently with your provider or via the handset toggle, and keep 1470 in mind for the calls that need your number shown. Just remember the limits: emergencies, freephone business lines and overseas routes can all still see you, and anyone running anonymous-call rejection will quietly bounce your withheld call.