How to stop using data on my Iphone?

I just got a txt saying i've used up 50% of my data allowance for the billing cycle. I've barely been on the internet or anything on my Iphone, when I first got the phone I was on the internet and stuff all the time and never got a message, i'm thinking I accidently turned something on or off and now it's using data like crazy. What can I do to fix this? I know I should call Verizon but i'm at work at the moment and can't and i'm not even on the account i'm just looking to see if anyone knows so I can fix this real quick, thank you!

Added (1). Turn on my Wi-Fi even if i'm not connected or can't connect?

Problem with icloud not transferring items?

I have icloud installed on imac desktop - macbook pro - ipad - iphone and ipod but when I download something on one of them it does not go on to the other items - can anyone tell me why - I thought it did it automatically

Speakers on IPad and IPhone not working?

The speakers on my iPad 2 are playing sound, but it sounds almost as though it were silent. I put it on full volume, and it just won't play high at all! I would need to put my ear to the speaker just to hear something. Also, if I put in headphones, no sound at all plays. I'm almost positive it has nothing to do with the settings because I tried that already.

The iPhone won't play any sound at all, and it had nothing to do with the mute button.

How to ship an iPhone to a different address (Sprint)?

I'm currently in the process of getting my best friend an iPhone 4S (new contract and everything). I've already got it ready to order but the only problem is that it can only be sent to the Billing Address of the Credit Card not the shipping address of the Sprint account. I need to send it to her place which is far from my place. Any way to work around this?

How to transfer email folders from my iphone to my computer?

My computer was recently destroyed along with all my email folders (with months of emails), These folders are still on my Iphone, how can I transfer these folders onto my old laptop?

Added (1). I'm using outlook and there's no back up on my server.

Added (2). Amanda,

That seems like the way to go about it but I'm not finding any clear answer on how to download my phone onto my computer

My sprint two year contract?

Yesterday i tried buying the new iphone 5 for 200 with the two year contract from sprint. But I couldnt because my contract doesn't end until next year in October. I've had my phone for a year already but I want to know if i cancel my contract now how much would it cost me?
or if i end my contract in mid January how much would it cost me?

there was also something about an upgrad which i don't understand. Please explain that.

Should I buy the iPhone 4s or the iPhone 5? - 1

So my parents said when my contract is up I can get an iPhone. But I don't know if I want the 5 because I'm going to need to get a new iHome and everything. So is it really a lot more better than the 4s? I'm 15, so I would use mine for texting, taking pictures and apps mostly. Which one do you guys like better?