Deleting a contact on an iPhone?

I want to delete this phone number on my phone. It may sound ridiculous, but here's the kicker. It's a FaceBook contact. I don't know how that's there. But it was this girl I texted a couple times, and she has a bit of a crush on me. I don't like her that way, but only as a friend. (And mainly because she's my friend's sister) She was always watching me on FaceBook, liking every single one of my updates and stuff like that. And we started talking on messenger, now my phone says she's a contact and I want it off. It doesn't take it off, and I want it to. How do I get it off?

Iphone 6s 16 gb or iphone 6 64 gb?

They are both £539.00 and I was wondering whether a 16 gb phone would be too small, also is the pros of the 6s would make up for the limited storage?
I'm upgrading from an 8gb ipod, which has finally died after almost five years of use. I ran out of storage very quickly due to my music library and photos using around 4gb of storage, so had very little apps and it was slow and I do not want to pay over £500 just to have it run out so is there a considerable difference between 8gb and 16gb?

What should I do with my iphone? - 2

So recently dropped my iphone with no case on and then I could see 2 white lines running through the screen and the touch screen doesn't work in that area and this morning another two line appeared and all of them run through the important apps and stuff and i can't press that area

Dropped my iphone in toilet. Now it works fine, how?

Dropped my iphone in toilet. Now it works fine, how? - 1

Added (1). I dropped my iPhone 5c in the toilet yesterday and immediately shook as much water out as possible, but it had a blurred screen with pink vertical lines, making the screen appear very distorted. I plugged the phone on charge and left it on full brightness in a bowl of rice for 12 hours and now the phone appears to be fine. The speakers are now working and they didn't appear to prior to me putting the phone in rice. How has this happened? Should I expect my phone to start glitching out soon?

Why does my snapchat camera suck but everyone's elses doesn't? - 1

Okay so first of all I don't use my snapchat, I just use it for the camera I have nobody on it, but I have instagram and I always see people posting pictures that they obviously took with the snapchat camera cause it'll show like the screenshot and everything, and there picture is like high quality and perfect, mines on the other hand comes out blurry and gross. I don't understand? I have the iphone 5s by the way.

AT&T partial discount on iPhone 5s or iPhone 6s?

I've been with AT&T for over a year and I'm on a 2yr contract. I just found out I was eligible for an upgrade on a partial discount. I was thinking about upgrading to either an iPhone 5s 32gb or a iPhone 6s with either 16gb or 64gb. I was wondering how much it would cost to do so and how would an upgrade fee cost. Anyone who with AT&T have any answers?