I need an unlock code for a : nokia 3100b type RH-50, IMEI : 352509/00/397636/6 AT&T wireless service (sold to Cingular but Cingular says they were not given the codes. Thanks in advance . Right now the screen is broke so I have to replace the screen. I'm still not sure if Cingular can reactivate the phone with the AT&T sim card or not.. Cingular's new sim cards do not work in the AT&T phone per cingular but if it is unlocked I'm not sure. can anyone provide info on whether or not I can unlock the phone and then get a Sim Card through Cingular to reactivate the phone and ultimately use it also in Jamaica on mission trips?