Just ordered ipad2 (my first) and it is arriving on Monday. I have ATT 3G on the ipad and want to get the prepaid $14.95 or $25 but I had some questions for those of you who have this model and plan. 1. If I turn it on say the 25th of October what is the latest day in Nov that I can turn it off? 2. Can I start using the $25 plan and then the next month switch to the 14.95 (how is this accomplished)? Any other "best practice" tips would be helpful. Thanks so much.