My iPhone 4S currently encountered a software glitch?

The Wi-Fi will not turn on. I never turned it off, it just randomly shut off. Whenever I try to turn it on, it stays grey and won't switch to on. My iPhone is running on software 6.1.3. I have read elsewhere that this version of iOS is glitchy. I have tried everything to fix it, but nothing seems to work. If I take my phone to the Apple store, don't they HAVE to replace it because it's a software glitch?

Should I upgrade from the iPhone 4 to the 5S or wait for the 6?

If I get the 5S I won't be able to get the 6 as I will be signing at least a 2 year contract and I'm upgrading from the iPhone 4. What should I do?

Added (1). I saw the iPhone 5C already and I won't be getting it. It was presented in the Apple keynote today alongside the 5S.

Where can I sell my iphone 5? - 2

I have a six month old iphone 5 that looks new, and I'd like to sell it so I can get the new iphone 5s when it comes out. The only thing is, it's under a verizon contract that has been suspended for non payment. Do I have any options besides breaking the contract? I mean people sale stolen iPhones all time so there had to be a way to do it. I'm not saying my phone is stolen (its definitely not) i'm just making the comparison because those stolen phones people sale are also under contracts, and people still buy them. Any advice would be appreciated.

Iphone won't connect to Wi-Fi? - 1

It was working perfectly fine until I got home from school today. I didn't have it connected to any other Wi-Fi except for that 3G thing that allows you to go on the internet without Wi-Fi - but costly.
Now it says its not connected, and when I go into the settings-Wi-Fi, it says my home Wi-Fi name its trying to connect, but it won't. I've tried turning it off and on, resetting it, everything. My laptop is connected perfectly fine, but my phone is not.

Explain the iPhone 5 and ios 7 to me?

So I've never been an apple user and now that I'm thinking about getting an iPhone, I'm pretty uneducated in the different versions. Does the iPhone 5 already come with ios 7? Or someone was telling me how I have to buy the iPhone 5 and then download the ios 7 system so I'm getting pretty confused… Help? I'm not talking about the iPhone 5S (which hasn't come out yet). Just the iPhone 5.

Difference between IPhone 5S & 5C?

Thinking of grabbing one since my 4S is getting a bit outdated, but I honestly don't see much of a difference between the 5, 5S, or 5C.

IPhone 5S battery life specs?

Does anyone know the physical size and specs of the battery in the new iPhone 5S? They didn't say. The processors are less power consuming I know but what is the physical battery specs? Anyone know?