I'm new to this site and I want to buy an iPhone. I currently am with T-Mobile so I want an unlocked phone to connect it with my current service provider. When I unlock the phone and connect it with T-mobile will I have access to all the features and programs that come with the iPhone when you connect it with AT&T Such as internet access? Or will I lose somethings other than support, warranty. Just trying to get educated before I spend the money! Thanks for the help.