Wifi suits my needs so far so have never activated a 3G plan. I will be traveling some for a week later this month and would be nice to have service during several all day road trips up/down I-95 corridoor. I'll be traveling I-95 between Virginia and South Carolina. How is the service while driving? Does service drop like a phone call? And can I sign up for one month, then stop/suspend service so I am not billed for following months?