Currently I'm on the $16 / month combo.  When I finish work at the end of the year I plan to go down to the $9 / month  combo.  Question is that if I find it doesn't work after one month and go back to the $16  one do I lose all my carry over  minutes and data from when I had it before. I guess the same would apply if I turned off the combo for a month and then go back..??

Thanx in advance..