HI, i think you are not following the instruction to unlock your Motoroi XT720 . please follow this..
Do not enter any wrong unlock codes on your Motorola XT720 MOTOROI mobile phones. If you enter over a certain amount of wrong unlock codes on your Motorola XT720 MOTOROI mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Motorola XT720 MOTOROI with a NOT ACCEPTED SIM Card,
2 - Phone will display "Enter Special Code",
3 - You can now enter the Unlock Code.
NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Motorola XT720 MOTOROI is locked to.
WARNING: If one of theses messages appear :
- "Contact Service Provider"
- "Tampert Alter"
- "Wait before enter special Code"
- "Contact Service'
It's because you or somebody already entered too many wrong codes, you just have to leave the Motorola XT720 MOTOROI ON with the errors message and after 40 minutes to 2 hours the message "Enter Code Special" will appear again!
i got this inforumation from Mobileunlocksolutions
. if you couldn't unlock your mobile, your code may be wrong , then you get the correct code from this provider...