Iphone data stopped working?

My friend gave me his old iphone today because the data wouldnt work. He had sprint and the sign would show up and the bars, but not lte or 3g or anything so it didn't work. I have cricket and all day it said searching for service, and eventually my phone died and i turned it back on and it was working with my data. An hour later it now says searching again.

IPhone 6s screen not working?

I cracked my phone and now the bottom, left side, and top doesn't work. I was wondering if there's anything I can do without having to replace the screen?:/

If you can see someone's location on your phone is it possible that it isn't showing right?

I've recently come across something with a friend of mines iPhone location. He had passed out n checked on him on my phone and it did show he was were he was however about 30 min later I checked n he was like 5-10 miles on some road. So needless to say I was mad cause we had plans. He told me sorry dude I slept longer than I was gonna. Is it possible that the iPhone location is wrong or its it always the true location?

IPhone 6s Plus screen color fades badly when watching movies?

I've had this phone since August of last year and it's been running fine. It's darn near perfect with a few flaws but no damage affecting the internal parts or water damage. When I watch Netflix, Hulu, my cable app, or YouTube my screen goes from colorful to this dull and colorless screen while watching movies. Is this normal? When I close the app my screen slowly returns to a colorful normal state. It's mostly noticeable when watching Friends.

My iPhone 6 was dropped in the ocean and it won't turn on?

Is there anyway I can extract the data from my phone? For instance, taking out a piece of hardware from it that could be put into another phone that will allow it to power up with all the same data, exactly the same as it would on my original phone?

Is a lifeproof case good for snorkeling?

Should I get a life proof free case for my iPhone to go snorkeling? It says it will last up to 6.6 feet deep i don't know how that works but would it last if I go even deeper?