We argued about jailbreaking. He says that jailbreaking would put a "limit on what the iPhone can do because it interferes with the network" (Which is AT&T) Now, i myself have jailbroken many iPhones, and argued the counterside. Seeing many people's iPhones jailbroken, and everything on them working perfectly fine. He said that if you jailbreak an iPhone, SOMETIMES, certain applications would not run, because of the jailbreak. Me being only an iPod Touch owner, I have little expirience, but I thought I was certain that jailbreaking was completely harmless. My knowledge was that jailbreaking simply allowed the Device to run 3rd party applications by opening the File System Tree He then brought up the warranty, and said "AT&T/Apple can detect whether you have jailbroken or not" I argued saying that a simple restore would put the iPhone back under warranty, but his wife being an AT&T technician makes me doubt. I would like clarification about all this please.