For those who think that doing good things has no reward are about to be proven wrong by Boost Mobile’s new plan.

The Monthly Unlimited with Shrinkage plan, and it reduces the usual $50 monthly charge to low as $35 by making payments on time.

The plan works by reducing the monthly charge by $5 after six on-time payments. So the first month would be $50, the sixth month would be $45, and so forth until the minimum of $35 is reached. Those with the BlackBerry plan start out at $60 a month until they get to the minimum of $45. If customers do end up missing a monthly payment date, they don’t have to start over from the maximum amount–they just pay their current rate until it drops to the next level. There is no penalty for missing a month. Customers can sign up for this new plan starting October 14.

The no-contract plan includes unlimited voice, text, web, e-mail, instant messaging, and 411 calls. Also reduced is the price of Boost Mobile’s International Connect feature, and it is $5 a month for unlimited calling to landlines in Mexico, Canada, the Dominican Republic, and some Asian-Pacific countries, as well as international text messaging.

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