nokia unlocking problem?

pbringas95

New member
so i wanted to unlock this nokia 6020 last night, and i tried the online codes that the web provided. i couldnt get a working code, so it was on hardlock. i brought it to school thinking that nothing was gonna happen with it anyways. it had an atnt sim card in it. then, my phone started ringing. it was receving messages, and when class was over, i was able to even send a message to my friend. atnt seemed to have worked all of a sudden. but after that, it lost all signal once more. there used to be a little G on the corner of the screen, then it became a G that was crossed out, then it disappeared. does anyone have actual explanation for this?
edit : the nokia 6020 was bought in the philippines from globe. and, this phone is like, triband or something. i actually dont know what that mean, but my mom said phones atnt sim cards are SUPPOSED to work with tri band phones.
 
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