by Aldian Andrew
When device locked change network to 2G/GSM, when unlock change to 4G/LTE only. Root is required, testing on Nougat ROM
Version 2 added function : Now when your wifi is connected, your network data will be disabled and network mode change to 2G/GSM and when wifi disconnected network data will be enabled and network mode back to 4G/LTE
Save much more battery!
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