Could be easier depending on how you use the phone. She has a 600/month plan that she hardly exceeded until she began talking to me. I got a 850/month plan for us both, she only uses it to talk to me so I got all 850 to myself, i'll never use that much. Once her contract expires, we're going to go into the family plan together, calculate our minutes and increase to whatever we need to cover the both of us. Right now she pays $50/month, if we went in on this plan together it would cost us $30/month each for 850 minutes, so we're bound to save money even after we jack it up a bit.

Defenitly a nice little first step on that road to financial and resource co-dependance sharing. ;-)