Why is my Samsung Galaxy S4 always hot whenever data is on?

when ever i just on the data it start becoming hot on the upper part of the phone that i can't place it on my ear to receive call

Hi oluwaseun. Do you have a lot of apps installed specially those that uses the internet? I'm sure that they're causing your phone to heat up. I'm using a different phone and this happened to me as well. What I did was uninstall some of my apps or put them disabled so they won't run.

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