Iphone 6 getting hot to touch

If it is getting really hot you should power it off and make an appointment to take it in to Apple for evaluation. You may have a battery malfunction.

While some usage can cause the phone to get quite warm, I would never describe normal operation as truly "hot" to the touch. That is not normal and you should get it checked out.

On the Apple web site you can find Apple Authorized repair centers near you under the support page. Or you can contact Apple and arrange to send it in. They will send you a box with shipping labels. Go to the Apple support web page for your country and look for the express support section.