I just bought two iphone4s, which have just been activated in Kaifeng and upgraded to 5.0. 1. I still need to know whether they are unlocked or locked.

As the title. I just bought two iphone4s, a white 32g and a black 64g. The white one is the English version of MD 245b/A, which is unlocked by online verification; The black one is MD 269 LL/A of American att, which was verified online. Most Chinese people say it is locked, and many English people say it is unlocked. Both of them were unopened. lz personally activated them, and there was no problem with the card of Dubai operator et. I won't be at ease when I come back at night. I upgraded to 5.0. 1 with itune, and there is still no problem with 3g 2g. Legend has it that there is a lock machine that will definitely not work after upgrading; It is also said that att didn't lock the phone before, and it was locked after 1 month; I don't know which statement is reliable, white peace of mind, black md269ll. Please look at the above situation and identify whether it is unlocked or locked. Is there a risk that nothing will be locked in the future? Thank you very much.