i have a nokia 3120b it's registered to Cable and Wirelss in St. Vincent and the Grenadines. I have tried to unlock it but it's telling me cannot undo retsriction or it's giving me a code error. can any one help? the IMEI IS: 356245001966333
Cannot undo restriction” or “Not allowd” means. After you have made 3-5 attempts and failed, the phone displays that message, meaning that the phone is "hardlocked." At this point, you will not be able to unlock it by codes. You will need to take or send it to a professional unlocker and have it unlocked directly with hardware.
To unlock the mobile yourself it will cost you between £200 & £300. Take the mobile to a shop(mobile) and get it done for about £5-30