Originally Posted by
bocastephen
I'm trying to figure out the catch - no cost for data? Impossible!
I'm also trying to understand the Mifi unit - can it just run off AC power or only off a rechargeable battery which needs to recharge outside of the unit?
You can run it off AC or you can use it's internal battery (which you do not need to remove to charge). They are offering a second external battery which is what's confusing you.