hi. I have a problem with my cell phone, It can not turn on, but battry is safe. the problem is about it's android software. if you can, answer my question.thanks
Go to Settings > Wireless Controls. You should see the option to turn on Bluetooth and also Bluetooth Settings, where you can set the device name & discoverability, and scan for other devices.
Restart your phone and try using Bluetooth again. If it really doesn't work, contact LG to find out where you can bring or send your phone to be checked and repaired.