When I'm feeling daring I take the case off. . . . .and it does feel warm/hot.....with the case on I don't notice and heat problems, I suppose the case acts as a barrier/heat sink.
If it gets very hot when you're playing games, that's not unusual. If it seems particularly toasty and the ambient temperature isn't hot, it would be worth taking it to an Apple Store for them to assess.
When does it get "Hot?" (During charging? During Certain applications or other uses?) Also, if the iPhone gets to hot, it will display a message on your screen.
Thx for the replies.
Normally it used to get hot when using certain resource intensive apps such as Zwift. But recently it's getting hot from just browsing the web.