I'm selling my iphone in preparation for the 3G, i want to wipe the data and sell it unlocked and jailbroken, ready for any GSM SIM card. what's the best way to do this--PWNAGE tool? If i pwn it on a Mac, can it then be used with a PC? Should I have my SIM card in it while I unlock/jailbreak? do i even need to backup my data for my new phone? or will all my calendars/contacts/etc sync upon activation? anything else i should know that isn't clear in the guide? Thanks!