I plan on getting the X. I like the idea of the mobile wifi hotspot...not so much for $20/month however. I don't really need it day-to-day, but I am going cross country in August for a week. Would it be possible to add the feature before the trip, and remove it when I am back home 8 days later? Ie. Get like a pro-rated price (~$5 for the week)? Or would you have to kind of activate it month-by-month a-la the iPads way of rocking 3g?