I unlocked my Focus back in December through NCKZone. Installed the Feb and March updates without a hitch. Now my phone is locked again to AT&T, when I try enterning the unlock code I got from NCKZone I get an error message that says SIM Error. Also, if I try to access the SIM through Phone Settings, it says the SIM is locked. I never had a lock on the SIM card, so I tried the default of 1111 to no avail. Only way to have access to the SIM is after a soft reset. Weird thing is phone is now locked to AT&T, and whenever I try the unlock code from NCKZone, I get a SIM error and it locks the SIM....anyone else experience this? Called AT&T, they were useless, they also transferred me to Samsung and all they could suggest is a hard reset.......