Switching from 3G to 4G LTE?

Okay, so my iPhone 4s has severe screen damage and I can't type on it without it glitching out and acting like I tapped somewhere else. My friend gave me his spare Droid razr HD. We tried just switching sims but since my phone is a 3g phone it wouldn't take. What would I have to do to get my number switched to this phone? I'm extremely limited to options because my parents probably wouldn't take me to the store.could I do this online? Would my friend be able to take me up there without an adult or would my mom need to be there?

Is there any way I can use my iPhone as?

Is there any way I can use my iPhone 3GS as a internet provider to my computer? I have no internet at home but there's free Wi-Fi where I can connect from my iPhone 3GS but can I use my iPhone to have internet on my pc via the USB cable? If I can, explain me HOW I can do it.

Selling black iPhone 5 64gb with iOS 7? How much could I get for it?

I'm selling because I hate apple now because of iOS 7
I'm sure it would be worth more with ios 6
But how much should I ask for it?
It is the most compatible model.
Had it sense it can out.
Not a scratch on it and is in like new condition. Has a 30$ Black case
I even have box, charger, headphones and Manuel
Still owe 200$ .

Apple Iphone 5c VS Ipad Air?

Which one should I ask for, for christmas? Ipad Air (Is it worth it?), or the new Iphone 5c? I really wanted to get the 5s, but it's just too much. Which one should I get?

Selling black iPhone 5 64gb with iOS 7?

How much could I get for it?
I'm selling because I hate apple now because of iOS 7
I'm sure it would be worth more with ios 6
But how much should I ask for it?
It is the most compatible model.
Had it sense it can out.
Not a scratch on it and is in like new condition. Has a 30$ Black case
I even have box, charger, headphones and Manuel
Still owe 200$ .

Should i get a blue or pink 5c?

I'm going to get an iPhone 5c soon. I really like the colors blue and pink for it but don't know which one to get…

Which color would you get? This would help me pick better.

Also, do you know of any good protective and cute cases for the 5c?

Someone who knows a lot about o2 & iOS 7 on iPhone 5S

I have 2 problems here.

My friend has an iPhone 5S on contract with o2, but has accidentally broken the screen. He's got a replacement through the insurance, and the broken one is just sitting in his draw doing nothing. He said I can have it, because I will pay to have it fixed, and he's already got his replacement. If I do get it fixed, can I put an o2 PAYG SIM card in it when it returns, or will it be blocked from allowing that? My friend said it could be, but isn't sure.

The second problem I have, is where do I get a free PAYG o2 SIM card from? Do I get it straight from the o2 website? I know they have to be activated, so can someone tell me how I go about doing that? Also, How do you top up on o2? Can you use a top-up voucher?

Thanks everyone. Can you please answer every question, because I need to know the answers to them.