Thanks for the info so far.....
No I have not tried to set up Whatsapp yet , I wanted to ask here first so I did it right ,
Mostly worried about the change of Sim cards and new numbers , and if they want to verify with Google voice , I think Whatsapp may be able to Text me overseas but not sure , as some things on Google search says yes and some says no
I wish Whatsapp used a name and not your phone number as your ID , that is what LINE does , but I know Whatsapp is not going to change that now !