So I just ordered the S3 today and moved my plan to share everything and added a new line. I want the S3 to be on my old number and my old phone (Razr) to be on my new number. When I get my S3, how do I make this switch?
When you get the GSIII, run through the activation process on the new line. Then you should just be able to put your old sim in, the new sim in the Razr and be good.