Fort Worth,Texas,United States

That hoariest of social networking devices, the telephone, is making a comeback among Hollywood marketers.

Facebook, MySpace and Twitter are considered essential parts of the entertainment factory's marketing arsenal. Add another service to the list: SayNow, a tiny Silicon Valley company whose low-key approach -- connecting stars and their fans through voice mail -- is gaining traction, particularly among teenage audiences.

Clearwire says it remains on track to launch its Clear-branded WiMAX 4G service in Atlanta next month, with Las Vegas slated for a late summer launch and Chicago, Philadelphia and Dallas/Fort Worth scheduled for rollouts later in the year.

Sprint plans to launch WiMAX-enabled wireless services in 10 more U.S. markets later this year, including Atlanta, Chicago, Dallas, Philadelphia and Seattle. Sprint's 4G wireless service will offer average downlink speeds of two to four Mbps, which the wireless carrier said is three to five times faster than current 3G service from any carrier.