Change without losing prior data WhatApp number

You can use the Change Number feature to change the WhatApp number and chat with the same phone on the same phone. Just want to have your phone on it._
  • Insert a new SIM phone and start your WhatsApp Account.
  • Click on the Account Options in Settings. Then two boxes appear, enter the old phone number in the box above and enter the new number in the box below.
  • Click on the option which will appear next to it.
  • Revert to your new number. Now you can use Whatsapp from the new number.

If you have a new phone, you will have to back up WhatsApp App in the previous phone and then it will have to be restored in a new phone.