Sprint Prepaid today announced the availability of rollover data for its month-to-month service. Customers' unused data will automatically roll over to the next month, and won't expire. Sprint is allowing customers to amass a total of 30GB of rollover data in their account. Sprint Prepaid offers three plans, all of which include unlimited talk and text. The $35 plan has 1GB of monthly data, the $45 plan has 3GB, and the $55 plan has 6GB. In addition to rollover data, Sprint Prepaid is offering customers who make nine on-time payments the option to upgrade to a smartphone lease. Both the rollover data and smartphone lease are only available from Best Buy stores.

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