hi there! this morning i just bought an iphone and its says on the box is week 39. so i assume the firmware is preloaded with 1.1.1 here is i want to do.. i have an unlimited data on AT&T and my sim is Cingular 3G not AT&T i dont want to activate the preloded sim provided by iphone. if this iphone is firmware 1.1.1.... im gonna use KMAC procedure to downgrade 1.0.2 and use jailbreak to activate. will my Cingular 3G sim will work on iphone? i hope somebody can answer me, till now my iphone is still untouch and unopened. i did all the search on google but i cannot find real answers. i will give 2hrs on this thread. and if there was no answer, im gonna go back to apple and replace this iphone to touch thanks in advanced.