I don't own an iPhone X but I have been seeing a lot of questions and complaints, on this and other forums, about the iPhone X getting hot, at least hotter than what iPhone users are used to.
If it isn't "too hot to touch"and if you're not getting any error messages, I will say that this appears to be normal. The logic board design on the iPhone X is different, opting for a dual-layer, sandwich like design that concentrates the heat signature to a smaller area of the housing.
Rest assured, the iPhone contain several thermistors designed to measure and monitor the heat of the logic board and if anything goes out of spec, you will see an error message.
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