So I will be upgrading another line on my family plan on AT&T.. this 2nd line actually doesn't have a data plan and want to keep it that way. Since the new iphone has a different sim card than my 4S, I can't simply do a sim card swap. Does anyone know what needs to be done to get the iphone 5 on my line once I get it? Is it possible to call up AT&T to have them assign the nano sim in the new phone to my number? or is that nano sim stuck on the 2nd line?