I have a CDMA iPhone 4, I have WiFi at school, at home, and most other places I would be, so tethering is not usually something that interests me. However, I am going away for a week or so and had a few questions about the mobile hotspot. 1) Is this something that you can add and drop at will, or once added is it stuck on the contract? 2) If I add it and drop it a week later, will they pro-rate the cost of it, or do I have to pay the whole $20? I know I can JB to do this for free, but to be honest MyFi and maybe a new messaging apps are the only two things on Cydia and not in the app store that really interest me. I don't feel like it's worth JBing to use MyFi for a week.