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Lg Harmony Pop up for network unlock code appears on the startup when you are trying to use it with any other network? It happens when you insert sim card from other network & the phone is locked by the provider. It can be easily unlocked by calling the provider (the free source) or you can get it unlocked by go to any mobile repair shop (variable charges) Network Unlock Code
If your phone is asking security code then it is locked.If you know your phone's security code you enter it.If you don't know the code please don't try because if the security code is wrong about 3 times then it will ask puk number and it will be more complications.If you didn't changed your security code default security code for Nokia mobile is 12345,Please try it.