Hey guys. i was planning to update my iphone 3G to the latest iphone software which is 3.1.2 (i think), and then i was going to jailbreak it (ONLY!!!!) NO UNLOCKING do i need to worry about the possibility of stuffing up my baseband or my contract with optus? ( i want to keep my official sim and contract) is it possible to jailbreak my iphone 3G without restoring it first? is blackrain the best option? which itunes version should i use? If i do jailbreak, will i still have full functionality like using my bandwidth of 500mb cellular internet safely? Is everything like jailbreaking and installing cydia applications and using ssh relatively safe? if i need to, i can restore back to default anytime i want right? i know this is a wierd question but i have a jailbroken 8gb ipod touch 1g and sometimes it gets quite hot. if i jailbreak my iphone, might it run really hot? hotter than it normally would if it weren't jailbroken? thanks to anyone who can help, cheers!