Migrate whatsapp from phone (old expired number) to another one? I have a phone now that have WhatsApp installed on for over 2 years now, and the phone number registered for the account is now history (it's been long gone and there is no chance I will get that SIM back, because it is from another country).

I got a new phone today with a new SIM, when I start WhatsApp , I put my old number but it needs to send a Message to the number and that is not possible. 

Is there any work around for this, I don't want to lose all my WhatsApp contact. Please help.
If you are concerned about the contacts and not the chat history then backup the contact in your old phone and import in your new phone. Sign in whatsapp with your new number and it will read all the contacts in your new phone and your contact will be updated.

Only downside is you need to send a whatsapp message to all the contacts saying that you changed your number