Thanks Abram! It's a pay-me-now or pay-me later situation. I like the month to month and I also heard it was Verizon towers.
You can get it with any of the big carriers backing their service. Some stores only offer one or the other, but you can get which ever service you want. If you have a phone that is unlocked you can use it, just switch to a ST sim card (stick with the same carrier).