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Sometimes things happen in our lives that force us to change our SIM cards. This means you will lose you accessibility to your WhatsApp account. In order to prevent this from happening, you can do 2 of the following: exchange your account for a new number, or just remove your account.
In order to do that, press the menu button on the homepage. Press "Settings", then choose the “Account” option shown below.
For removing your account, press the specified option and delete the number you want to delete the particular account from.
For changing your account, follow these steps:
Then enter the old and the new number and finally press “done”!