Open WhatsApp on your old phone

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Step-by-Step Resolution: Reclaiming Your WhatsApp Account
Addressing a "phone number doesn't match account" error typically involves a systematic approach:

Verify the Number You're Trying to Register: First, confirm that the phone number you are entering into WhatsApp is indeed the one you intend to use and, more importantly, the one you last registered with WhatsApp. Ensure it's in the full international format (e.g., +88017XXXXXXXX for Bangladesh, without any leading zeros).
Utilize WhatsApp's "Change Number" Feature (If Applicable): If you still have access to your old phone with the old SIM card and the old WhatsApp account active, this is the safest and most recommended method.
Insert the SIM card with your new phone number into your old phone (if possible, or ensure your old phone still has WhatsApp active with the old number).
Go to Settings > Account > Change Number > Next.
Enter your old phone number in the first field and your new phone number in the second field (both in full international format).
Follow the prompts to verify the new number. WhatsApp will migrate your account details, chats, and groups to the new number, then delete the old number's association.
Re-register with the uk whatsapp mobile phone number list Correct Number: If you've changed numbers without using the "Change Number" feature on your old phone, or if the issue is a typo:
Ensure the SIM card for the correct (or new) number is active in your phone and can receive SMS or calls.
Uninstall and then reinstall the latest version of WhatsApp from your device's official app store.
During the registration process, carefully enter your phone number in the full international format.
Await the 6-digit verification code via SMS or a phone call. If you don't receive it, check your network connection, ensure you have SMS services enabled, or try the "Call me" option.
Troubleshoot App/Device Issues:
Restart your phone: A simple reboot can often resolve temporary glitches.
Clear WhatsApp Cache (Android): Go to Phone Settings > Apps > WhatsApp > Storage > Clear Cache.
Update WhatsApp: Ensure you're running the latest version of the app.
Check Internet Connection: A stable internet connection (Wi-Fi or mobile data) is essential for successful verification.
Addressing Account Compromise and Long-Term Prevention
If you suspect your account has been compromised, or you're locked out due to someone else registering your number:

Immediately Re-register: The moment you successfully verify your number on your device, anyone else using your account will be automatically logged out.
Enable Two-Step Verification: This crucial security feature (Settings > Account > Two-step verification) requires a PIN when you register your phone number with WhatsApp. Even if someone obtains your SMS verification code, they cannot access your account without this PIN, providing an extra layer of defense against unauthorized access.

Never Share Verification Codes: This is the golden rule of WhatsApp security. Your 6-digit verification code is the key to your account. Never share it with anyone, not even friends, family, or individuals claiming to be WhatsApp support.
Resolving a "phone number doesn't match account" error often comes down to correctly registering and verifying the number WhatsApp expects to find. By understanding the core principles of WhatsApp's account system and following the correct troubleshooting steps, users can efficiently overcome this hurdle and maintain seamless communication on the platform. Proactive measures like using the "Change Number" feature and enabling two-step verification are your best defense against future mismatches and potential account security issues.