The Root Causes of a Number Mismatch

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Several scenarios can lead to WhatsApp displaying a "phone number doesn't match account" error:

SIM Card Change Without WhatsApp Number Update: This is the most frequent culprit. If you've recently changed your mobile number (e.g., got a new SIM card in Bangladesh) but haven't formally updated it within WhatsApp's settings before trying to re-register or transfer your account, WhatsApp will still be looking for your old number. The app expects the active SIM in your phone to match the number registered to your account.
New Phone, Different Number: When switching to a new phone and also using a new number, if you try to register WhatsApp on the new device with the new number without first using vietnam whatsapp mobile phone number list the "Change Number" feature on your old phone (with your old number), WhatsApp won't recognize the account.
Typographical Errors During Registration: A simple mistake when initially entering your phone number during the registration or verification process – a missing digit, an incorrect country code, or an extra character – can lead to WhatsApp attempting to register an invalid number, causing a mismatch.
Temporary Network or App Glitches: Less common, but sometimes a temporary network issue, an outdated WhatsApp app version, or corrupted app cache can cause a communication breakdown between your device and WhatsApp's servers, leading to a perceived mismatch.
Account Compromise (Rare but Serious): In rare and concerning cases, if someone has managed to register your WhatsApp number on another device (perhaps through a SIM swap scam or if you inadvertently shared a verification code), your account will be taken over, leading to this error message on your original device. WhatsApp accounts can only be active on one phone at a time.