I currently have services with Att with the nokia 3650 phone. I was looking at Tmobile and noticed they have the regional rate plan @ 49.99 for 3000 minutes. So what im asking is is that can i switch over to Tmobile and keep my 3650 phone or do i have to buy a new 3650 from Tmobile? And does the regional rate only cover you in CA and NV? Thnxs..