In terms of what average consumers can actually buy, that may be true: Though networks will be in place in two cities this year, Verizon's LTE won't launch commercially until 2010, according to Verizon Executive Vice President and CEO Dick Lynch. But for Clearwire and partner Sprint Nextel, which began with a head start against LTE measured in years, the clock is ticking. Once projected to reach 100 million subscribers by the end of 2008, the new Clearwire joint venture is commercially available in just two metropolitan areas. The company wouldn't say anything else about its rollout plans on Wednesday.

But the WiMax trailblazer is gearing up to give more details about its strategy on March 5, when it announces its financial results for the fourth quarter of 2008. Those details may include dates for commercial availability of the high-speed mobile data service in Chicago, Washington, D.C., Boston and Dallas-Fort Worth, possibly very soon. Sprint Nextel's WiMax division was already building networks in those cities before the joint venture with the original Clearwire was completed in December. Clearwire is also working on converting its more than 40 pre-WiMax networks to true WiMax over time.

Clearwire may want to hurry with its deployment, because Verizon is moving aggressively to roll out LTE. Most observers don't expect widespread LTE availability until 2011, but Verizon said Wednesday it plans to have networks in 25 to 30 markets in 2010. LTE isn't expected from the other major U.S. carrier, AT&T, until 2010 or later.

WiMax and LTE use similar technology and are designed to deliver multiple megabits per second, on average, to each subscriber. Clearwire has said its service provides between 2Mb per second (Mbps) and 4Mbps to subscribers on its existing network in Baltimore. Verizon said Wednesday its LTE tests show speeds as high as 80Mbps, but it wasn't ready to discuss the average speed, and the 80Mbps might be divided among multiple subscribers in an area.

LTE's biggest advantage is its backing by the Third-Generation Partnership Project (3GPP), the force behind 3G technology among GSM (Global System for Mobile Communications) service providers. GSM is the dominant cellular system in the world, and even Verizon, which currently uses CDMA (Code-Division Multiple Access) instead, is turning to LTE.