Actually, world phones from cingular should be unlocked. Have you tried to put in another carrier's (t-mobile, At&t) sim card? If it is locked it would display "enter unlock code".

To get the unlock code from cingular you need to be out of contract. Send a e-mail to [email protected] with your phone's IMEI and contact info.

Otherwise you should use a unlocking service such as http://gsmliberty.com but proceed with caution.

Warning: Do not try to enter unlock codes more than 5 times as your phone may become permanently locked!

FYI: AT&T never gives out the code, T-mobile does it after you've been a customer for 90 days.