Hi All. I searched all over and couldn't find the answer. I had a 16GB 3GS with 3.1.2, 5.11.07 modem firmware and latest iboot (tethered jailbreak, also registered on saurik's server). I sold the iphone after a restore to stock 3.1.2 on ebay to a guy a month ago. Now he opened a conflict with paypal - he can't jb/unlock. I'm trying to help him out. He's outside the country and I didn't give him my AT&T sim card. My questions: 1) Do you need an AT&T sim card to jb/unlock an AT&T phone? 2) Do you have to be on AT&T's network? Thanks in advance. PS: I had successfully used blackra1n/blacksn0w previously to get a tethered jailbreak/unlock and i'm aware of the 3.1.3 apple firmware, if that's what you're thinking.