IPhone 4S, How to Turn Off 3G?

So I just got my iPhone 4S and was wondering how I turn off 3G when I'm not connected to my Wi-Fi? It's not a problem at home but if the internet went down or if I left home with my phone it instantly switches to 3G and I'm not sure how to turn it off. I did find something under the "Mobile" section in settings that I can enable/disable 3G but it turns to "GPRS" instead. What is this and does is cost?

Can the black iPhone get IOS 7?

I'm getting me an iPhone next week I'm getting a black one I'm wondering if the black iPhone 4 can get the new iOS 7. I heard some people say no because its too old. I have the white iPod touch it can get it cause its old. My friend has a black iPhone she doesn't have IOS 7 on hers. And she has the iPhone 4. Can the black iPhone 4 get IOS 7 or not? Why doesn't my friend have it on hers?

How to sell my contract iPhone?

I have an iPhone 4S and am wanting to sell it to get a 5s, but I'm still paying my phone off as I got it for free, how could I sell it? Also how would I be able to take my sim out and still have apps on the phone itself?

Is there an app on the iPhone 5 that let's me sample music? - 1

Is there an app on the iPhone 5 that let's me sample music?

I'm looking for an app on the iPhone 5 that allows me to sample the music I have stored on my iPhone, and save it as an mp3 or mp4 file for use. Does this exist? If so please let me know!

I've asked this question before and no one seemed to understand the question. When I say sample music, I mean sampling in the realm of music production. Like what music producers do. On PCs, you can sample using several different types of programs (Adobe Audition for example). Does the iPhone have any apps that can sample?

Much appreciated

How much could I sell a chipped but working iPhone 4 for really?

I don't want to sell to a business because I probably wouldn't get a good price at all. It's a white, iPhone 4 8GB. Works perfectly fine no cracked screen it just has a lot of nicks and chips on the side, which are easily hidden with a phone case. Other then that it's a good phone, not unlocked but with AT&T. What could I realistically ask for for this phone? I tried eBay but most phones listed are broken for parts or cracked screen, mine isn't that bad.

My iphone won't show up on itunes?

I have an iphone 5 and an acer laptop (windows 8) and when I plug my phone into my laptop I can see my photos so it has connected but my phone does not show up on itunes. My itunes is up to date and so is my phone and it randomly stopped connecting last week.
Please tell me how to fix it, thanks!

Added (1). Using a different cable does not work. My phone does connect to the laptop, just not itunes.

Iphone 5s lock button broken?

I've had my iphone 5s for only 2 weeks and the lock button is already very hard to press. I haven't done anything with it si it's very strange. I'm so worried it will stop working after a while (it works, I just have to press a little harder than usual and it doesn't make a clicking sound). Will it completely stop working after a while?

Why does my iPhone open my Windows 8 Photo App upon connection?

So a few hours ago I had been trying to upload all of my pictures from my phone to my new windows 8 computer. I had clicked the 'Import Photos and Videos' selection at the top of my screen when I plugged my iPhone in. When I finally solved the problem and got my pictures, I made another problem for myself. Now whenever I plug my phone in, my computer opens my Photos App and begins to import all of my photos again. This happens every time I plug my phone in, and the notification that usually pops up at the top when I plug my phone in doesn't pop up anymore.

I have tried uninstalling my phone from the computer as well as turning my computer AND phone off and then on again.