We currently do not have any unlocking instructions for the Geo GC688 mobile phone.
We are working towards finding the unlocking instructions for the Geo GC688 mobile phone. If you know the unlocking instructions for the Geo GC688 mobile phone and would like to help others who are trying to unlock the Geo GC688 mobile phone, please send us the Unlocking Instructions.
You can however still try the following method to unlock your phone. Let us know if it works.
1 - Switch ON your Geo GC688 with a NOT ACCEPTED* SIM Card,
2 - Enter the Unlock Code.
*NOT ACCEPTED : We mean, to use a sim card from a network other than the network your Geo GC688 is locked to.