In the unfortunate case that your phone becomes lost or stolen, we can help make sure that no one can use your WhatsApp account.
You should call your mobile provider as soon as possible to lock your SIM card. It will then not be possible to verify the account on that phone again, as you must be able to receive SMS or phone calls to verify an account.
After you have locked the SIM in your stolen phone, you can use a new SIM with the same number to activate WhatsApp on your new phone. This is the fastest way to deactivate your account on the stolen phone. WhatsApp can only be activated with one phone number on one device at a time.
If you are not ready to activate WhatsApp on a new phone with the same number, we can deactivate your account. Email us the phrase "Lost/Stolen: Please deactivate my account" in the email body and include your phone number in the full international format as described here. Please note that we are not able to help you locate your phone. Remote WhatsApp deactivation from another device is not possible.
Important: Even with the SIM card locked and phone service disabled, WhatsApp can be used on Wi-Fi if you do not contact us with an account deactivation request.
Note: Because your chat history is stored on your device, we cannot retrieve your previous messages.
WhatsApp Support Team