My Iphone 4S Overheating after calls?

Help please,

I've been using my Iphone 4s for 2 years and its been good and fine.until this week.whenever i make calls or receive calls the phone heats up real hot after like 5 minutes of talk time. And it doesn't heat up with Wi-Fi. Its not the 3g on continuously problem because i don't even use 3g. And my carrier signal is ok at 4 bars.i've been in the same location as i was 2 years back and its not location issues.

also i don't use internet on my phone just normal cellular calls and messaging activities. My phone has been dropped several times before and it was fine and good as normal.though i did accidently drop it this week but then it was still fine. My battery though when i charge it it heats up and yeah.

i don't know why when i make calls or receive calls the phone gets extremely hot suddenly? It never was like this before.

Its probably fine, it should get warm when used alot.

Time to upgrade. 5s is really nice! Get one!

Same Problem for my iPhone 4s since last week. Any solution please reply

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