Just got my iPad 3G and need a little education on the 3G billing/payment. I plan on using the service for maybe 3 or 4 months out of the whole year. If I don't deactivate the service does it automatically bill me for next 30 days? And do you have to wait to the end of the 30 day cycle to cancel (seems like a PITA, if that's the case) or can I cancel 5 days into the 30 day cycle if I know I will not continue the service the next month. TIA.