I'm with Sprint now for those 25,000 miles.
Someone else on the boards mentioned www.bigzoo.com. I use it during the day or in-state (when Sprint nickle nights isn't in effect.) Pre-paid phone time on-line. You buy time with a credit card and they give you a pin. No physical card. 3.9 cents anytime in the lower 48 states. Easy to recharge account for more time and able to see record of calls on-line. Must dial their number and then a Pin,I just put on the speed dial and it takes less than 10 seconds to complete a call. I look at it as the best of both worlds. 25,000 pts. and cheap phone time. And there is always Freeway which is free and even better if you have the time.
I will be with Sprint or MCI as long as they keep those 25,000 miles coming. My loyality can be bought.

I read in one of the finance mag. (doctor's office) that under 5 cents it becomes unprofitable for a phone company to keep records and bill you. That is why "bigzoo.com" makes sense. They can give you phone time so cheap because no bills to mail and only on-line recordkeeping.