I can't open any apps on my iphone 3g?

I don't know how to fix it please help! Yesterday I synced my iphone to another computer I didn't know that we can't sync on more than one computer. And right now I can't open any apps when I tried to it opens for a second then goes back to the home screen!

My iphone 3gs' screen is completely white and my home button is broken?

I do not have insurance or anyway to get a new one. I have tried to charge it and plug it into my computer. I really need help please anything will help!

Added (1). The battery was completely dead when i went to plug it in and this occurred. I'm not very computer savvy so if you could be detailed with how i could fix this id appreciate it!

ITunes opening when I wake/turn on my PC?

Hi, Recently whenever I turn my computer on iTunes just quite happily opens, also when my computer goes into sleep mode and I wake it up iTunes opens, It's very annoying because I buy a lot of things on my iPhone and never download them on my computer. Anyways it slows EVERYTHING down. Does anyone know how to fix this. 10 points for best answer, Cheers.

Can I sync a jailbroken iPhone to iTunes?

I'm new to the whole jailbreak thing… I have a tethered jb on an iPhone 4 with iOS 6… Is it possible to sync to iTunes without losing every thing I have done so far… I would like to back up my iPhone and put some music on my phone!

How to get a replacement iphone 4s w/ applecare?

Recently, the back of my iphone 4s cracked. I still have applecare for another year. Is there a way to get another one without having to pay out of the pocket.

p.s. I wouldn't mind paying the 30-50 for a replacement, except I'm a college student w/o a job. (an excuse, but those are the facts right now lol.

How to turn off roaming on my iPhone 4s with iOS 6?

I want to turn off roaming so when i go to europe, i'm not hit with a huge bill. I went to settings>general and there was no "network" option. Does anyone know how to get there. Remember i have ios 6 which has different layout than the ios5 in settings mode.

I dropped my iPhone 4 and cracked the back glass?

I've had my iPhone 4 for almost 2 years now and the contract runs out in January. (I have Verizon.) well today I dropped it without its case and the back shattered. How much would it cost to get it fixed or could I replace it myself? It's the black 32gb.

Added (1). It's not a 3 year contract its a 2 year contract. I got it in January 2011 and the contract runs out in January 2013.

Can I use a normal plan on an iPone?

My uncle got the new iPhone so he gave his iPhone 4. I was wondering if I can get a normal plan (just call/ text) with Verizon. I don't want a data plan because I can do everything with my Wi-Fi.

Why can't i download apps on iphone 3g?

I've had a 3g before but i broke it.
My brother gave me his old 3g and I can't download apps on it, it says i needed to upgrade it. So i tried, and apparently i can't? WTF IS GOING ON? AND WHY IS APPLE ***. If i have to upgrade to an iphone 4, i'm going to cut sick.(i'm poor) please help me.