Sprint today expanded its ongoing bill-slashing promotional campaign to its subsidiary Boost Mobile, giving Cricket and MetroPCS customers a chance to lower their monthly cell phone payments by switching to Boost Mobile service.

Through July 20, Cricket and MetroPCS subscribers who bring their phone number to Boost Mobile can save between $20 and $30 per month for a full year with the promotional plan. Customers will be required to purchase a compatible Boost device to take advantage of the deal.

The value associated with the Slash Your Payment in Half promotion from Boost Mobile is undeniable. A MetroPCS customer that is currently receiving 2GB of data for $40 a month, can now get 2.5GB of high-speed data from Boost Mobile for just $20, while a Cricket customer receiving 10GB of data for $60, can now get the same amount of data for only $30 a month.

Following the year-long promo period, customers who switched to Boost Mobile will be migrated to the Boost Mobile plan that offers a comparable amount of data, with prices that range from $30 to $55 per month.

Sprint began running its bill slashing promotion in December, offering Verizon and AT&T customers a chance to cut their payments in half by switching to Sprint. The promo is still available for eligible AT&T and Verizon customers.