Where can I unlock my AT&T iPhone 5?

I'm looking to unlock my iPhone 5 that is locked to AT&T. Any suggestions on a reliable website that offers unlocking services will be greatly appreciated.

How is the iPhone 4s better than the iPhone 4?

I'm not going to get an iPhone 5, and the iPhone 4 is cheaper than the iPhone 4s, but does it come with a lot less? And can you get Siri for iPhone 4 by updating it or something? Is the iPhone 4s better overall?

Jack problem for iPhone 4 s?

Basically I bought my iPhone like a month ago and Like 2 weeks ago I had realized as soon as I plug in my headphone my left one doesn't seem to work, I then tested out DR. Dre beats solo and it was the same thing but if I plug my headphones to a different device it works perfectly fine… And i found out yesterday that the headphones only work when I call someone but one side don't work if I watch videos or music…

Someone please help!