How to explain this...I was initially on a plan with my girlfriend under my moms name, due to lack of credit at a young age. Although it was in her name it was our plan. Recently my mom added my sister to the plan also. My question is now that I have better credit AT&T said I could open an account with $0 deposit. How would I get my girlfriends line and my line to their own account under my name and have my sister stay under my moms? Any help is greatly appreciated.