Okay so my story goes by I have service that's T-mobile and so today i got a Iphone 3GS from someone which he had AT&T service and it was apparently jailbreaked with a app called cydia, so when i first put in my sim card in it was fine i had service and work perfectly but then i connected it into itunes it asked me to update to ios 5.0 and so i did and i waited for 2 hours and then i click update and it restored my iphone thinking all of the original owners apps and stuff would be gone but then the iphone said no service and no sim and it was locked i guess and on itunes it says theres no sim in the iphone which im attempting to activate. what can i do? or am i screwed and i am unable to even use this iphone. any suggestions would help. could i sell this phone but to who? and If NY INC reads this i really wish to email u but i cant yahoo wont let me and how could we trade?