Restore phone and keep whatsapp number after changing sim I am going to restore my phone and I want to keep my whatsapp number.
The thing  is, after restoring I am going to use a new number. 
Restoring my phone means I will have to reinstall whatsapp, then I will be asked to verify phone number. My old SIM is not working anymore.
What should I do to keep my old whatsapp number?

I am using samsung galaxy nexus android version 4.2.1
Insert the new SIM into the phone.

Go to Whatsapp settings > Account > Change number

Validate the new number.

Go to Chat settings > Backup conversations

Follow the instructions here to restore the conversations