One of my friends was, to put it mildly, quiet upset today. He received a cell phone bill for, drum roll please, $400. I knew that he recently switched carriers and got a new phone and thought that the high number was due to him buying the phone from the carrier and the carrier charging him for this month and next month, not an uncommon practice. Turns out it's his second month. Also turns out he likes to talk, a lot. He's got a 400 minute plan, subtract weekends, that's an average of 20 minutes per day. However, he's been spending an hour to an hour and a half per day! With that kind of usage, you can burn through your minutes in less than a week. What happens with the other 3 weeks? Thirty five cents per minute, at least 60 minutes per day for 15 days plus the $30 plan cost plus taxes, fees, charges, yep, that's $400.
Here's a lesson to all of you, it's 400 minutes per month, not 400 minutes per day. Take a calculator, divide your total minutes by 20, that's your daily allowance. And having rollover minutes only helps if you have minutes to roll over.