Sprint is rumored to be working on a 3G-enabled femtocell, a cellular device that helps you get a better voice and data signal in your home or office.

It will be a faster version of the wireless carrier’s Airave product, according to documents filed with the U.S. Federal Communications Commission. The new Sprint femtocell will include a radio for the 3G service and a port for a VOIP (voice-over-IP) line.

Sprint’s move comes two weeks after AT&T presented its $150 3G femtocell, MicroCell, and just as a new study indicates the femtocells could proliferate in the next few years. The global femtocell market is projected to grow to $4.6 billion in 2014 from $230 million in 2009, says Marketresearch.com in a report released Thursday.

Japan and Western European nations lead in femtocells today due to high rates of mobile and broadband penetration. But the U.S. is expected to have the largest femtocell market in 2010, with a high annual growth rate, says the report.

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