Why does my iphone heat up sometimes?

I was watching youtube when I realized that my phone was getting warm. When I took off the cover and held the phone it was even hotter than maybe 100 degrees because in comparison to my forehead temp when I have a fever, the iphone was even hotter than that. Why does this happen? How to I fix it?

Iphone 6+ IOS 9 error 53 problem?

I'm having a problem installing the IOS 9 to my iphone 6+ it would not install on my phone so I had to do it through itunes on my laptop. Everything looked like it was going fine but then half way through the installation it stopped and have me an error 53. I tried it again on my other laptop (mac) and still nothing it kept giving me the same error. Also when i try to turn on my phone it just gives me the itunes logo to plug it into my laptop and either update or restore I tried both & still that same "error 53" appears. I don't understand what the problem could be, I've never had to replace my screen or home button. Can someone please help me figure this out?

How to recover a snapchat you recently sent?

How to recover a snapchat you recently sent? - 1

Added (1). Last week I sent a snapchat video of my dog doing a trick, and he suddenly passed away so is there any way I could recover that video? I understand snapchats are never actually deleted or whatever.

Added (2). And it also looks like people can do it on Android, I just can't figure out how to do it on an iPhone

Solar power iphone charger case?

Yes it exists. But i'm looking up the good things about solar powered charger cases for my ap environmental science project. Its about making an advertisment of something like "green technology" and how its good good for the environment instead of polluting and wasting.

Is she playing with my feelings?

Ok so I have a friend who's a girl, and I'm a boy. So we were texting at night, and the she suddenly asks me "Who do you like?" And I texted back saying "I beg your pardon? You mean what girl do I like?"And she texts back yes. And I said "Uh a girl who goes to our school." And that girl is her I really like her. And she texts back"Oh, no one really likes crying face emojis. And i texted back "Oh uh well I'm so sorry and sad to hear that. Nobody really likes me either." And she texts back"Somebody likes you." I was like confised and said "Who is it?", "Is it you or some one else?" "you like me don't you?" Hopon shed says yes and she texted back "Ok then I do like you, I just think that you're kinda cute." I said thanks your cute too and I admit it The girl I like is you! Blah blah blah blah sorry this is long. Please excuse any bad grammar i'm typing from an iphone. What does "kinda cute," mean? "Dpes she actually like me?" Please no rude answers. Please say your opinion.

How come my iPhone 6 won't charge?

I'm having problems with my iPhone 6. When ever I plug in my USB cable, there are times that it will charge but most of the time it won't. Majority it won't charge. Also I recently got a new USB cable from the Apple Store and it still has the same problem. What can I do to fix this situation?