My iphone keeps overheating?

I have a iphone 4, with 6.1 update. I had it plugged in and I have an otterbox defender case and it shut off and gave me a temp warning. I could feel the heat through my otterbox. I had to get a second iphone because of this same problem. But when I unplug it, it cools down. Is it just the charger?

Try using a second charger, the cord may be faulty and it could be giving excessive power to the phone. If not the cord you may want to try closing some of your apps. To do this click the home button 2 times while on the home screen, a little bar will come up. Simply hold the app like you going to delete it but instead it shuts off the app.

Put your charger in the freezer for fifteen minutes and when you take it out, plug your phone in. If it doesn't fix it, get a new charger.

Is the case keeping the heat in? It definitely shouldn't get that hot.

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