IPhone lock button chooses when to work, what do I do?

I had a Lifeproof case on my iPhone but when I came out of the pool, there was water inside, most of it was by the bottom. Now, I've dried it and everything seemed to work fine, but a few hours later now, the lock button won't lock but when i hard reset by holding down the lock button and the home button, it works! Any help would be appreciated, what do I do?

IPhone 6s Camera not working, what's the problem?

I recently left my phone on the back of a car… And it rode down the road for awhile before deciding to fall off and it fell facedown and shattered the entire thing. After getting the screen fixed, (luckily it was fixable) i noticed later that day a light white spot thats really small on the top of the screen slightly to the right from the center. My back camera is cracked, but it was previously to this and it worked just fine. My camera app just shows a black screen and neither the front/back camera work. On snapchat, it says to go to settings and fix my restrictions to allow my camera to work, but there are no restrictions. I have checked every setting. Any ideas what could be causing this?

Can I use any sim to activate/set up straight talk iPhone 5s?

I recently ordered a straight talk iPhone 5s from swappa. I plan to just use it as a Wi-Fi device but my question is, can I use any sim card for the initial set up or does it have to be specifically straight talk sim. Also does the sim have to be activated and working? And after the initial set up and activation can I simply remove the sim card and the phone still work as a Wi-Fi device? Sorry this is my first time buying a phone.
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Why does my phone keep turning off?

For the past week my phone (iPhone 5s) keeps turning off quite a bit daily. Can anyone tell me what's going on with my phone? Btw I got it this Christmas

My front faceing camera is green when i use the flash (iphone 6s plus)?

My friend dropped my phone and the whole screen smashes really badly, so we took it to the repair shop and replaced the screen with a original apple screen (thats what the guy said he will use) but not, when i take selfies with my fromt facing flash they are green tinted. Is this the problem with the new screen, could it be fake? Or could the camera get damaged during the fall?

Can a iphone be locked to two networks?

Can a iphone be locked to two networks? - 1

Added (1). I bought a iphone 6s off ebay and I want to use my pay monthly sim on EE on it however its saying SIM Not Supported, so I did background search on it, it saying its carrier is UK o2 tesco, so I requested it to be unlocked on tesco which they said they would however I'm not sure if I should contact o2 too?

Should I get my dad iPhone 6s or iPhone 7?

I'm a 15 year old teenager who have a part time job. My dad has a iPhone 5 right now and it's time for him to get an upgrade. My dad has done so much for me that it's time to give him something.