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uk Technology & digital loss messaging app account takeover • registered on another device • account being registered alert • someone trying to log in • verification code scam • sms code request scam • whatsapp registered new phone • signal registration lock • telegram login alert • sim swap warning signs • phone number hijacked • number ported without consent • unexpected verification text • locked out of chats • contacts impersonation risk • linked devices check • two step verification pin • account recovery steps • phone lost service suddenly • suspicious login notification

What to do if…
your messaging app says your account is being registered on another device

Short answer

Treat this as an account-takeover attempt until proven otherwise: don’t share any codes, and immediately try to log back into the app and secure your mobile number with your network provider.

Do not do these things

  • Don’t tell anyone the SMS/voice verification code (even if they claim to be a friend, your bank, or “support”).
  • Don’t tap “approve/allow” prompts you didn’t initiate.
  • Don’t keep chatting as normal if you suspect takeover—your contacts may be seeing messages from an attacker.
  • Don’t use “help” links or phone numbers sent by text/DMs; scammers often impersonate app support or your mobile network. Use official app settings and official contact routes.
  • Don’t factory reset your phone in a panic (it can make recovery harder and doesn’t stop a SIM swap/number transfer).

What to do now

  1. Pause and do a 10-second reality check. Did you just install/reinstall the app, change phones, change SIM/eSIM, or request a sign-in code?
    • If no, assume someone else is trying.
  2. Try to regain access in the app immediately (before doing anything else).
    • Start the app’s normal sign-in flow for your number/account.
    • Only use a verification code that you requested directly in the app just now. If a stranger is pressuring you to “share the code you received,” that’s a takeover attempt—don’t do it.
  3. Check “linked devices / active sessions” inside the app and remove anything you don’t recognise.
    • Log out unknown devices/sessions right away.
  4. If you’ve lost mobile service (no calls/texts/data), treat it as a possible SIM swap/port-out.
    • From another phone, contact your mobile network provider using an official number and say: “I think my number may have been SIM-swapped or ported. Please stop any port/transfer and restore control to my SIM/eSIM.”
    • Ask them to add or reset any account passcode/PIN and any available number-transfer/porting protection so it can’t be moved again.
  5. Protect money and accounts tied to your phone number—quickly.
    • Call your bank/card providers (use the number on your card or official app) and ask them to watch for unauthorised activity.
    • If key accounts use SMS codes, switch them away from SMS to a stronger method (authenticator app or security key) as soon as you safely can.
  6. Secure the “roots”: your email account and your mobile-provider account.
    • Change passwords (unique, strong) and turn on strong sign-in protection (app-based 2-step or security key where available).
    • Check for new forwarding rules, recovery email/number changes, or new signed-in devices on your email.
  7. Enable the messaging app’s extra protection once you’re back in.
    • Turn on the app’s two-step verification / PIN / registration lock feature (names vary by app).
    • Store the PIN somewhere safe so you don’t lock yourself out later.
  8. Warn your key contacts (briefly) using a different channel.
    • Tell a few people: “My messaging account may be under attack—ignore requests for money/codes from me until I confirm.”
  9. If you suspect fraud in England/Wales/Northern Ireland, make a report to the national service.
    • Report cyber crime/fraud via Report Fraud (online), and use 999 if it’s an emergency or 101 for non-emergency police contact.
    • If you’re in Scotland (or it happened there), contact Police Scotland (typically via 101 for non-emergencies).

What can wait

  • You don’t need to decide today whether to change your phone number—focus on regaining control first.
  • You don’t need to “audit everything” right now; do the root accounts (mobile provider + email) and any money-related accounts first.
  • You don’t need to confront the person you suspect or reply to scam messages.

Important reassurance

These alerts are common during scams and number-takeover attempts, and they can be frightening—but fast, simple actions usually stop the damage. The goal is to regain control of your number and sessions first, then harden security once you’re steady.

Scope note

This is first steps only, aimed at the first hour or so. Later steps (like extra identity protection) may help depending on what was accessed.

Important note

This guide is general information, not legal, financial, or technical advice. If you’ve lost money, can’t regain your mobile service, or see signs your bank/email were accessed, prioritise direct contact with your providers using official channels.

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