I was looking at a forum site for the LG Optimus L7 II Dual P715 and found some techniques that work on the device – Accessing HIDDEN SETTINGS!
Go to dialer and dial 3845#*715#, you will then be prompted for the service code, various options like AAT Device test, ELT test, Sw Sanity Check, Device test, Settings, WCDMA only, WLAN test and much more!
Warning: you should never make any actual changes in the Hidden Menu unless you know what it will do.
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