How much could i get for my iphone 5?

It has VERY light scratches on the side of the phone and i would be including my lifeproof case with it. The phone has no problems and works 100% perfectly. I really want to sell it so i can turn around and buy the galaxy s4. What can i get for the iphone 5?

Can I get an iPhone 4 and use SIM card from iPhone 3GS?

I got a 3GS last summer and I absolutely dislike it. I want to buy an iPhone 4 but, I'm on a 2 year contract. So I was wondering if I can buy an iPhone 4 on Craigslist/eBay etc. And just put my sim card in it? And if I can do this, can I restore my 3GS and just sell it?

What photo editing app is this?

I'm looking for this picture filter or editing app for iPhones (not sure if it's an exclusive) that makes this cool 3D effect, does anyone know what it is? Here are two examples! Thanks!

First; image
Second;

My iphone 4 keeps on crashing?

So, it all started today. All the apps on my phone keep on crashing and if not automatically it would freeze then crash. Every time I try to use any social apps (Facebook/Tumblr) my dashboard/feed won't load, whenever I go on safari it will also crash and my tabs end up deleting on its own (?) and my history won't save, my mail won't load either and when I tried to edit and save an event on my calendar it said "Saving error has occurred".I'm also having trouble sending text messages.
-My phone isn't disconnected, I payed my bill this month.
Does anyone have any idea as to what is going on with my phone? What should I do? Are there any solutions? Has anyone experienced similar problems, what did you conclude from this problem?
Note: A few days ago I was using my phone and the screen got a bit wet and I immediately dried it off. I was thinking that what happened to my phone was probably the problem. But, wouldn't the effects of my phone getting wet be shown much sooner? Do you think my phones screen getting wet is the problem?
I really need help! I know this is a long question but I really need suggestions and advice.

I locked myself out of my iphone?

Well i just bought my iphone 4s and it came yesterday and isn't activated so i can't go to the store and i really dint know the password, so is there some kind of way i can go on the computer and remove the password please help

Instagram won't let me comment or follow?

It's only happening to my account. My friends can comment and follow! I tried accessing my account on another person's iPhone but it still won't let me comment and follow!

Every time I comment, it disappears after I hit refresh! I tried to post a pic with a caption. As soon as I posted it, they removed my caption! And when I hit a follow button, it immediately unfollows! I can only like photos! People can still follow me/like/and comment my pics, I just can't follow anyone back anymore or comment! What's wrong?

I tried turning off my device, deleting instagram app and getting it again, logging out/logging back in!

What happened!

How to use my old contract iPhone?

I have got an old iPhone that was on contract but have upgraded since, I want to be able to use the iPhone again on pay as you go, how would I do this?

How to find out blocked numbers?

For the past 4-5 days a person keeps prank calling me and its getting annoying. How do I find out their number? I tried using *69 but it doesn't work. Does anybody know how? Please! Thanks no mean comments! (I have an iPhone 4 AT&T) just in case.

IPhone 5 won't connect to iTunes? - 1

I've tried everything, reinstalling iTunes, turning off my phone, the computer. I tried all three USB ports. I know my cable works because it works through my plug and my iPod touch connected and synced fine. I tried reinstalling my drivers, and it's not even charging my phone, let alone recognising it in My Computer.

My computer is windows 7 and this phone. Is brand new and works fine apart from that, and I don't know what it is. Can some help me, for the love of god.

Will I pass this or fail miserably?

Ok, so my algebra final is tomorrow, and our teacher is splitting it up into 150 questions, half tomorrow and half the next day. I don't do very well in math, and have never really ever done well in the subject alone.

My averages/semester grades are:

1: 76
2: 83
3: 80
4: 71

My mom told me if I pass this class with AT LEAST a C she'll get me an iPhone, which I've wanted for about 5 years now. I just need to know: A. What are my chances? B. What score would be sufficient in order to pass with a C? C. How much will my grade go down if I score a 50 or lower?