FOR MOST SAMSUNGS Turn off our phone, put in a SIM of a provider that it is not locked to, and turn it back on. at the wrong card massage type *#9998*3323#. Amasage wil pop up telling you to press exit, so hit right softkey. choose 7 or 8 your phone will reboot and your sim will work. type. *0141# and hit call. your phone is personalized power down your phone insert a sim card other than the one that is in it. power back yyour phone at the sim code prompt type 00000000 that is 8 zeroes. your phone should be UNLOCKED GOOD LUCK AND LET ME KNOW