Well im going to get the Iphone 3G from cingular and i really want to jailbreak it so i can receive multimedia messages and many more apps that can be done after the Iphone is jail broken, but i really don't have the slightest clue on what program (the best one to jailbreak the Iphone) or how to complete the jailbreak. Also another concern that i have is how to undo the jailbreak after it is complete (for apple store purposes)