This is the code that need to be typed on the LG G4’s Dialer to get access on hidden service/diagnostic menu.
This will automatically open up the service menu on your device. If it does not, then this means that your network operator has removed the menu from the firmware of your variant of the LG G4.
Warning: Using this at your own risk, do not change anything if you don’t know anything about this.
To check your LG G4 for any hardware defects, you can head over to Device Test -> SAAT – Service Menu – Manual Test and then individually select each hardware that you want to check. You can also conduct an automatic test by selecting the ‘Service Menu – Auto Test’ option.
To change network mode, you can head over to Filed Test -> Modem Settings –> Network Mode.
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