i just got out of a long distance relationship and had gotten a family cell plan with the BF. my two cents:
-don't get a family cell plan. if you're both on the same network, then chances are that the calls won't use minutes anyway. but, if you're going to do it, then get verizon because if you break up, you can break away from the contract and assume liability for the phone. then you're only locked into a one year contract and the SO is still stuck for the duration for the plan