I am buying this iphone from a guy who has iphone 3gs 3.1.3 (5.12 baseband) and his serial number starts with MC935 (released in week 35???)Does that mean this is the old bootrom and can be downgraded and/or jailbroken? I have an AT&T connection, so I dont care about unlocking it.... Just need jailbroken apps and tweaks. I gotta get back to him ASAP.... so if someone can gimme a reply, it's highly appreciated [PS i knw the sn0wbreeze tool v1.4 and 1.5)apparently jailbreaks 3.1.3 with old bootroms... Can I take my chance??? This other guy is selling his phone whose serial number starts with 87002.... Does that make sense??? (NOn MC Model???)... can this be jailbroken/unlocked/downgraded? Which one should I buy?