Either the sim card is locked or you need a PUK code.
Both, u will have to contact your network provider
Press and hold the following keys at the same time: Volume Down Key + Power/Lock Key on the back of the phone. Release the Power/Lock Key only when the LG logo is displayed, then immediately press and hold the Power/Lock Key again. Release all keys when the Factory hard reset screen is displayed.
Warning : Do not enter
any wrong unlock codes on your LG GR500 Xenon mobile phones. If you
enter over a certain amount of wrong unlock codes on your LG GR500 Xenon
mobile phone, your phone may get hard locked and sometimes become
unusable.
1 - Switch on your LG GR500 Xenon with a NOT ACCEPTED* SIM Card.
2 - LG GR500 Xenon will display "phone restricted" Select "Cancel".
3 - LG GR500 Xenon will display "phone restriction code" Enter the Unlock code. Select "OK".
4 - The handset is now successfully unlocked.
*NOT ACCEPTED : We mean, to use a sim card from a network other than the network your LG GR500 Xenon is locked to.
(OR)
1 - Switch ON your LG GR500 Xenon with its ORIGINAL SIM Card.
2 - Enter2945#*9701#.
3 - A menu will pop up, Select Sim Unlock.
4 - Enter your Unlock Code and press OK.
5 - The LG GR500 Xenon will then reboot and the unlock is complete.
ORIGINAL: We mean, to use the sim card that was originally given to you by your network/service provider along with the LG GR500 Xenon.
(OR)
1 - Switch on your LG GR500 Xenon with a NOT ACCEPTED* SIM Card.
2 - Type *#865625#.
3 - Enter the unlock code twice.
4 - LG GR500 Xenon should say: Network Lock Deactivated.
5 - LG GR500 Xenon may automatically reboot and is now unlocked!
NOT ACCEPTED : We mean, to use a sim card from a network other than the network your LG GR500 Xenon is locked to.
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