*MiWi ...Got this info from Engadget. Apparently, ATT is starting to crack down on those who use their iPhones to tether their iPads and other wifi devices. I don't know how they find out but they sent out text messages or letters to warn people to either pay up or not use mifi tethering altogether. I was gonna get MiWi for my iPad and now I don't know if I should do it. 
http://www.engadget.com/2011/03/18/...-using-unauthorized-tethering-methods-to-pay/
http://www.engadget.com/2011/03/18/...-using-unauthorized-tethering-methods-to-pay/