i dont ever use aim so i cant help there to put music on your berry #1 make sure you have a sd mini card or your will slow down your berry and have problems..hook it up to your mac once it shows just click and drag to your music folder.. to find your pin remove your battery or go to options statrus you'll see it there
Yea if you try it on another carrier it wont work I think. I know for Verizon you will get a message saying it doesn't meet the requirements or something like that.