Mine's 10.5.6 and its been working fine for a week already. I do notice that on BT, the connection dies when iPhone sleeps sp I have to set the screen to permanent. Not sure if its just me. MMS has been fine thus far, VM is not supported by my carrier. OP, if yours is a unibody, then BT can't work n tethering can only be achieved by USB. Read tha of TUAW or gidzmodo.