I successfully unlocked my AT&T Samsung A437 using the method described in this thread, but when I re-inserted my AT&T SIM card, my contact list was all but wiped out. All I have left are a couple of numbers I stored on my SIM card and 7 numbers AT&T provides for services (checking bill balance, directory assistance, etc.). These latter numbers seem to be stored in the phone, but maybe they are hardwired in. All of my missing numbers were stored in the phone, rather than on the SIM card. Has anyone else experienced this?