I got an ATT phone with my sister, a two year contract a while ago and the contract is over since august but I'm still using the phone. Now I want to go join my brothers plan and get a new phone. My question is, do I have to disconnect my phone first before getting a new contract with ATT? If I go tomorrow and they get me a new phone while my current one is still connected, could I still keep my Sim card info, like my current phone number?