3GS to 4S on AT&T network
I currently have a 3GS but getting a 4S.
Here's my problem. Right now I have spotty "G" coverage (low or no bars) and often need to turn the "G" off to get a signal. I understand that you can not turn off "G" with the 4S. Is there anyone, in a similar situation, with spotty "G" coverage having problems with their 4S?
Question: If I keep my 3GS by adding a line, would I need a separate data plan for or can you share either minutes or data with your existing line? Asking because I've heard of family plans with other carriers that allow sharing of minutes but not sure about the data. Currently I have unlimited data with AT&T.