My iPhone 6S has varied colored vertical lines on the left side of the screen?

My phone has been cracked for a bit at this point, but it had been working completely fine up until today. I turned on my phone to see these vertical colored lines leaning towards the left side of the screen and taking up around 2/3 of it. The right side is working perfectly fine. Also, when I use the phone, it clicks random apps without me clicking on them. I tried to hard reset, and nothing worked. How do I fix this?

Bullied for loving my little pony?

So I'm 14 and I'm a high school freshman and when I was trying to take my iPhone case off, I accidentally turned on the display, which then revealed my mlp iPhone wallpaper. One of my classmates saw and it gave me a weird look and asked me what that wallpaper was. Then he started to laugh at me. A few days later, I showed him and his friend a funny meme and all of a sudden my classmate took my phone and browsed through my pictures that were full of mlp images (no clop images). Then I went back to the image of them meme and him and his friend started to make fun of me and bullied me for liking the show. I'm also a sensitive person with no defense against them two because I'm not too much of a social person and I feel bad after being bullied by them.

Is it possible to replace the iphone 6s screen with an iphone 7?

I went to the apple store the other day with my brother because the home button on his iPhone was broken. The employees that worked there said that the home button was part of the display, and that he would need to replace the entire screen to fix it. Is it possible that I could take my iPhone 6s to a third party screen replacement store and have them replace the display for an iPhone 7 display in order to get the heat sensor instead of the actual button that I have now? I know that it would ruin the warranty of my phone, but I literally have one day left on it so I could care less.

What is network unlocked Iphone?

I want this easy to understand, Is a network unlocked iphone usable as soon as I get it from online. Or do I have to pay more ******* money to use it.