How to track this IP address?

Well, my brother's HTC Sense account was hacked. They spent ~$400 on apps on our T-Mobile family plan. We know it was his account that was hacked since he is the only person with an HTC phone in the plan. I recently got an iPhone and everyone else in my family has one. My old phone is still in service under AT&T. But we know that account wasn't hacked because around 12:00 pm all the phones under the t-mobile service plan went out of service for about 10 minutes. I just need to know how to track down the guy's IP so we can get him fined. :/ Thanks: P

Work with AT&T on this. They do not want any of their customers to get hacked and if it is possible to track the hacker, they will. Oh and do it soon due to the possibility of any logs getting deleted.

  • Will I be okay to give my address to him? I posted an ad on Craiglist looking to buy an iPhone and I found a guy. He seems legit and I googled his email and found he has a Facebook page which seems very legit (married with a new-baby son) so will I be okay to give him my address? He lives in California while I live in the UK.
  • Why can't I use @icloud.com email address after updating to iOS 6? I've updated my iPhone to iOS 6 and according to Apple I'm supposed to receive an @icloud.com email address that matches my @me.com address. But why can't I log in with the supposedly new address?
  • Kindle books billing address? I'm going to buy a book for my iPhone off kindle books what is the billing address for? Does a bill get sent to your house? Or does a email just get sent to confirm the purchase?
  • Is there anyway to track exact address of stolen iphone 4 without app? I never got icloud or find my iphone on my phone. It got stolen and when I looked it up yesterday and today on family locator(verizon) I was able to find an area location on where it is. It doesn't give me the exact address though. Are there any websites that would be able to give me the exact address?