3. From your settings menu, select the Account category.
4. Tap Delete My Account.
5. You’ll be notified of what will happen if you delete your WhatsApp account, and asked if you simply want to change the phone number associated with your WhatsApp account instead.
If you’re sure that you still want to delete your WhatsApp account, you’ll need to confirm a few details. Tap the top box highlighted here and select the country that you live in; this will set your country code. Then, tap the box labelled “Phone Number” and use your (virtual) phone keyboard to type in the phone number associated with your phone. Finally, tap Delete My Account.
Done! Your WhatsApp account is now history! We’re sorry to hear that things didn’t work out between you, but hopefully, you’ll be able to find a similar service that will fit your needs better!