How to delete your WhatsApp account on iPhone
- Make sure you have the latest version of WhatsApp. Check the App Store on your iPhone to see if there are any updates.
- Open WhatsApp and go to WhatsApp Settings > Account > Delete My Account.
- Enter your phone number in the full international format.(foe example,if you are from India your phone number will start with +91 and your ten digit phone number.)
- If you are sure you want to delete your WhatsApp account, tap Delete My Account.
How to delete your WhatsApp account on Android
- Firstly,open WhatsApp.
- Press the Menu Button > Settings > Account > Delete my account.
- Enter your phone number in the full international format and tap Delete My Account.
How to delete your WhatsApp account on Windows Phone
- Make sure that you have the latest version of WhatsApp from the Store.
- Open WhatsApp and tap More > settings > account.
- Click delete account and enter your phone number in the full international format.
- Press continue at the bottom of the screen to finish deleting your account.
Source: whatsapp.com