I have a jailbroken 2G (used with T-mobile) and just bought a 3gs that seems to be unlocked, jailbroken, and at 3.1.2. What now? Do I just move my sim card from one to the other? How? Do I need some kind of tool? I don't know what all of this is but the new (lightly used) one has blackra1n and cydia listed on it and I was told it was untethered.