TMobile's plan will update the expire date of the minutes when you add more minutes, so it doesn't necessarily cost anything per month, if you're actually using the phone on any kind of regular basis. For instance, I had 45 minutes due to expire early next month but when I added more because I was getting low, the expire date became July for my total minute pool. Their minimum is $10 for 30 minutes that lasts 30 days; I prefer $25 for 130 minutes that lasts 90 days, plus pretty soon I roll over to gold status, which ups that to 150 minutes that last a year, allegedly, though that I can't confirm through usage the way I can the rest.