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What a Sprint/T-Mobile deal could mean for prepaid plans

Prepaid cellphone plans could get more expensive if a Sprint and T-Mobile merger is sealed.

That's because often cheaper prepaid plans initially came about as a way for wireless carriers to get their foot in the door with consumers, noted Mike Prospero, reviews editor at Laptop Mag.

"The reason Sprint and T-Mobile offer these plans is a way to grab market share at the expense of revenue. Combined, they would have nearly as many subscribers at AT&T and Verizon, so there'd be less incentive to offer lower-cost deals," Prospero said.

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The current trend among wireless carriers, especially at AT&T and Verizon, is toward family plans, which not only bring in more customers, but help companies retain those customers by potentially making it harder for an individual customer in a group plan to switch to a different carrier, Prospero noted.

On Thursday, reports said Sprint agreed to pay about $32 billion to acquire T-Mobile.

Read More T-Mobile and Sprint zeroing in on a $32 billion merger

As a combined entity, the two carriers would have about 100 million subscribers, about as many as Verizon and AT&T have each, according to Prospero.

The possible Sprint and T-Mobile deal is just one of the megamergers the FCC is considering this year. Cable provider Comcast has agreed to pay $45.2 billion to acquire Time Warner Cable and AT&T has struck a deal to buy DirecTV for $48.5 billion.

In general, industry consolidation leads to concerns that less competition in the marketplace could lead to higher prices for consumers across the board, Prospero noted.

—By CNBC's Althea Chang.

Disclosure: Comcast is the owner of NBCUniversal, the parent company of CNBC and CNBC.com.