How much is the early upgrade fee for AT&T? - 1

Right now i have the iphone 4s, my upgrade was last year.about a month ago i wanted to see what the status of my upgrade was and it said that i have an early upgrade but there would be a 36 fee which i'm okay with. I'm looking to buy the samsung galaxy s3 but i was wondering how much is the early upgrade fee?

Why is my iPhone acting like this, and how do I fix it?

I've had my iPhone 4s for about 2 years and today is the first day this has been happening. Its basically turning on and off by itself, and while I'm putting in my passcode the brightness gets low, and it erases what I type in so I have to put in my passcode fast. You know how when you want to turn your phone off completely, and you press the power button for about 10 seconds, and on the top of your screen it says "slide to power off" and on the bottom there's a button that says "cancel"? Yeah, well that has come up by itself many times. I have turned my phone completely off and turned it back on, and have rebooted two times, but this still happens. I don't know what to do. Has this ever happened to you? What should I do?

Is 8GB on an iphone enough space?

I need to buy a new phone and its between the 8GB iphone 4 or the 16GB iphone 4s. Obviously I want the 4s but in my situation the 4 is almost 100$ cheaper, and i'm not loaded with money. But i'm worried Ill use all the space on an 8GB phone.

I use facebook, instagram, twitter, vine and play games some other apps. I don't take tons of pictures, but i'd still like to be able to take some without worrying about space. I would like to have some music on it, but its not a necessity. So do you think I would have enough space with an 8GB, or should I just put out more money and get the 16GB 4s?

Can i sell my contract iPhone 4s?

I want to get rid of my iPhone but still have 10 months left on the contract, is there a way i can sell the phone and contract to someone?

Can IPhone texting apps be traced?

Can IPhone texting apps be traced?

Added (1). I mean like if i got the text free app on my iphone could it be traced and it would come up as my phone