Why won't my iPhone let me download anything anymore?

I have the iPhone 4s, and ever since I updated my software to the iOS 6.0, I can no longer download anything to my phone. No apps, no songs, movies, I can't download any of it. For example, when I try to download an app, I tap the price then it says, BUY APP in green. Then I tap BUY APP, and it says that it is installing for a couple seconds, and goes back to the price.

My iPhone 5 won't play music through ANY headphones?

I just got my iPhone yesterday, I haven't dropped it or anything.

Today I wanted to listen to music on it and it played out loud instead of the speakers. I tried 2 other headphone sets to make sure it wasent just the ones i was using.

*I have already tried blowing into the headphone jack to clean it of dust particles.
*I have looked in the headphone jack to see if there was anything in it.
*I tried 2 different pair of headphones.

This is RIDICULOUS. If anyone is having the same problem, or the solution, please feel free to leave a comment.

Can I use a Sprint Jail broken iPhone for sprint?

I recently had my iPhone stolen and I have sprint, I'm still in a two year contract and don't qualify for an upgrade till next year. So my friend said he would sel me a iPhone for sprint which is jail broken, And I was just wondering if that would work for sprint? Can I go to the store and ask if I can get my same number and a sim card and use that iPhone instead of buying a brand new iPhone because I can't afford the prices of an iPhone retail. Or if there are any other options or maybe if you had a similar experience?

Would changing your iphone APN get you unlimited data?

So i have a att 300mb data plan and i hate it. I want unlimited though i heard if you goto unlockit website it changes your APN so you can go on the internet for free. Will changing apn make my data unlimited. My iphone is jailbroken btw.