IPhone 6s glitch or battery problem?

I just got the iPhone 6s a little over a week ago and as of recent, I've noticed that when I charge my phone, it dies quickly. I also noticed that when I charge it, it stays on one percentage for a long while and when restarted, it changed to its actual percentage which is always higher than the previous. I also noticed my phone got really hot when I was in an area where signal could not be reached. What is wrong with my phone?

Try to hard reset it and also try Leo Privacy Guard to make your device totally secure.

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