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I've bought a very cheap Android 8.1 tablet (which has 2 sim slots) just to play about with. As it's cheap, the battery isn't wonderful and it has a very short life before it needs recharging. The main culprit is "Phone Idle" which uses a vast amount of CPU time, whether I have sims installed or not. I don't actually want to use the phone at all, just the tablet features; is there any way of completely disabling the phone functions ?

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  • Can you become root? Then you should be able to disable this system process.
    – Rainer Glüge
    Commented Nov 24, 2019 at 12:43

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Try turning on airplane mode and turn on wifi.

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