IPhone 5S not working after upgrading to iOS 9?

It was working for a while, then, when I went to switch apps, the screen completely froze. I can't restart it, I can't do anything. I can hit the buttons and they work, I can't switch to the homescreen when I want to. What should I do?

I FORGOT MY IPHONE 6 PLUS AT SAVEMART?

OMGOMGOMG I'm 13 AND WHEN I WENT TO THE STORE WITH MY MOM AT SAVEMART I LEFT MY PHONE. ITS AN IPHONE 6 PLUS AND I KNOW SOMEONE WILL FIND IT AND TAKE IT!

Should I get iOS 9, or wait?

I have a iPhone 5c, and I'm wondering if I should wait until a bug fix or two comes out? I know it's really more meant for the iPhone 6, so will it work well for my phone if I get it right now?

Itunes says I have 347 photos but there are only 72 photos on my iPhone?

I'm trying to clear up iphone space. I have 72 photos on my camera roll and yet the photos from iTunes take up 3.7 GB and itunes states I have 347 photos. I already synced an empty photo folder to my iPhone but somehow the photos from iTunes still end up there. And, I can't find the 347 photos anywhere on iTunes or my computer? What's up?! Or are the photos stored on another computer since I have 3 comps authorized for my iTunes account? Btw, I don't link photostream to my iPhone.

IPhone 5s fingerprint scanner not working after screen replacement?

I have a iPhone 5s and It felt down. The screen got cracked. So I replace the display. I accidentally broke the original flex cable when I repair it. So I reassemble it without putting a new one. (finger print scanner not working bcz it's broke) today I bought a new flex cable at 13.59$. When I put it, it doesn't work. The home button works but the finger print not.

So why it isn't working? Is it a problem with the display (I think it's not a original one)
Or something wrong with the flex cable?

Sry for my bad english.

Erase all content and setting.Delete some else's iCloud?

My uncle gave me a used iPhone 6.Everything is fine except for that. Its still signed into the past users iCloud. I want to know if I Erase all Content and setting. Will it erase the past users iCloud account from the phone?

Huawei Ascend Mate7 vs Apple iPhone 6 plus?

I want to buy a smartphone but I'm confused between these two. I read online that Huawei ascend 7 has 5 megapixel front camera and 13 megapixel back camera, while iphone 6 plus has 1.2 megapixel front camera and 8 megapixel back camera. I want the one whose picture quality is high. But does the greater megapixel mean the better pictures. It would be nice if you can tell me about them in detail and from experience if possible. And which one is the best for selfie.