In re: the new iPads, the Apple site says the 4G arrangement with Verizon or AT&T is a "no contract" arrangement. I presume this means you can initiate a month's 4G service and then cancel it after the month, and then restart it at a later date, all without startup costs or penalties. I have very limited need for 4G. Is my interpretation correct? And how about "tethering" to my iPhone 4s? Can I easily do this with a JB'd iPhone and use its "3G" abilities on a new iPad? Thanks!