The P777 (aka E800 from samsung) is from Cingular and we're trying to use it with T-Mobile. The phone is for my girl, HELP! Thx.
To anyone reading this: success! This code unlocks most newer model samsung phones (the ones I know for sure are x427m, and E800-Slider phone aka SGH-P777 for Cingular) -- put in the sim card you want the phone to work with, turn it on, the message will say "wrong sim card", press *#9998*3323#, it ask you to press exit, it will reset it self, then a menu will appear-pick the "maliou fail" and the phone will reset and work with your sim card! WARNIING!!! -----keep the code---- If you take the battery out or the phones battery dies, it will reset back, sooo, KEEP THE CODE