Sprint is boosting its prepaid wireless service with the new, albeit uncreatively named, Sprint Prepaid.

Similar to the carrier's Virgin Mobile USA and Boost Mobile brands, Sprint Prepaid allows customers to pay in advance, eliminating the need for a long-term commitment.

Expanding on last year's As You Go no-contract offerings, Sprint Prepaid includes new pricing and new devices—the Spark-enabled Samsung Galaxy S4 Mini, 4G LTE-capable Samsung Galaxy S III, and 3G Moto G, as well as the pre-owned Apple iPhone 4s.

All four smartphones are available at launch. Sprint expects to add more handsets throughout the year, while basic plans for feature phones will be introduced next month.

"Our goal is to respond to customers' shifting demands by featuring a variety of wireless plans that meet different needs," chief marketing officer Jeff Hallock said in a statement. "This new Sprint Prepaid offer allows us to play more competitively in the monthly prepaid space."

Participating users can choose from two plans. The Smart plan comes with a $45 price tag, unlimited talk and text, and a Wi-Fi-only data plan, though it is not available on the iPhone 4s. Smart Plus includes unlimited talk, text, and 2.5GB of data for $60, though video streaming may be limited to 3G speeds.

"Prepaid plans are a viable solution for many consumers, and we're now making these available to people who have an affinity for the Sprint brand, are looking for savings, and desire no-contract options without compromise," Hallock said.

Pick a Sprint Spark-enhanced LTE device, and you can also enjoy the carrier's fastest data speeds, available only in Spark coverage areas, currently in Kansas City, New York, Los Angeles, Chicago, Baltimore, Philadelphia, and eight other markets.

The program, unveiled in October, combines an advanced network and device technology to deliver 50 to 60 megabits per second. Sprint intends to roll it out to 100 of America's largest cities over the next three years.