Moto G3 is pretty old now but because of developer we could taste new features by the availability of several custom roms. Out of so many different roms, MIUI ,One of the most Popular and Feature rich Android UI is now available to moto G3 in its stable release. Though its not official build but still it handles all your day to day work from calling to internet. It is most stable rom for moto g3 and improves the battery life too. Some people may have a doubt that does this custom ROM has VoLTE support so answer is yes. *Requirements:
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