A new incentive for pre-paid wireless customers

You'll get more for your money with no-contract wireless – as long as you pay your bill on time. Today, Boost Mobile, one of the pre-paid arms of Sprint, rolls out Monthly Unlimited with Shrinkage.

It works like this: The basic Monthly Unlimited (unlimited phone, text, data, IM and 411) is $50. Pay your bill on time for six months and your monthly tab drops to $45. Hit 12 months of on time payments and you go to $40. And with 18, you lock in at $35 for as long as you're with the carrier. Oh, and the months don't have to be consecutive; they're additive. If you pay on time for two months, skip a month or two, then pay on time for another four, you still get your $5 off.