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My sony xperia Z1 battery and charging point were recently changed as they were faulty, but the phone still gets hot. What could be the problem and how can I solve it please very urgent.

It might not be a problem, as I know a lot of older phones will get hot when in use for long periods of time. As long as it is not too hot to the point where it burns your hand to hold it, I wouldn’t worry about it.