By W. David Gardner

Cellular VoIP services will generate more revenue in the U.S. than fixed VoIP by 2012, recording more than $18 billion versus about $12 billion for fixed VoIP, according to a report released Monday by Analysys.

Although mobile phone VoIP is still a rarity today, the upgrade of CDMA2000 1x EV-DO to Revision A beginning in 2007 and the upgrade of W-CDMA to 3G Long Term Evolution (LTE) beginning in 2010 will hasten the move to cellular VoIP by service providers, the market research firm said.
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