Okay so I bought iPhone 2G on December 1. I plan on buying the new iPhone 3G on July 11. I want to give my iPhone 2G to my friend who has a contract on t-Mobile. I plan on using ziPhone to unlock, etc. and get my phone to work on her carrier. My question is, will her bill automatically go up if she starts using data i.e. checking email, surfing the web, etc.? Does she have to do anything official with t Mobile to get her new iPhone to work with her plan? I would assume her bill would go up if she's using data but if it's all through an unofficial means how does this exactly work?? She doesn't have a ton of money (which is why I wanted to give her the gift of an iPhone), so I don't want her bill to rise astronomically. So what will happen to her bill/contract when she activates my iPhone on her tMobile plan??