Had a question for sprint iPhone 4s users. Ive had at&t for over 10 yrs and want to switch to sprint cause every time I reach 2g, they slow my speeds. (I stream a bit, but don't get wifi everywhere)..Ive heard that sprint doesn't do that, but wanted to know if their speeds have improved as i know that they were a problem when iPhone 4s first came out with sprint, thanks..