TV stations currently have to shut down broadcasting on their analog channels on Feb. 17, freeing up valuable frequencies for mobile data services, but new legislation would push back that date to June 12. The federal government has run out of money for coupons to subsidize the cost of converter boxes, and officials say too many consumers aren't aware of the transition. The Obama administration has called for a delay, and Sen. Jay Rockefeller, a Democrat from West Virginia, last week introduced a bill in the Senate that would push back the day of reckoning.

Verizon, which opposed an extension early last week, became a cautious supporter on Friday. In a letter to Rockefeller and other Congressional leaders, viewed by IDG News Service, Verizon Chairman and CEO Ivan Seidenberg said Rockefeller had assured him there would be no further extension beyond the June date.

"Events since Monday have reduced the danger of repeated delay and Verizon, as a result, can support a carefully limited extension of the deadline," Seidenberg wrote.

Both Verizon Wireless and AT&T Mobility plan to use frequencies that will be freed by the transition to deliver mobile data services on LTE (Long-Term Evolution) networks. AT&T, which doesn't plan to roll out LTE until 2011, had granted its backing to a limited extension before rival Verizon did. Verizon plans to begin commercial LTE deployment in 2009, though its network won't go nationwide by the end of this year.

Qualcomm, the mobile technology vendor now building a national network for broadcasting digital TV to cell phones, has a more urgent need for analog channels to be vacated. CEO Paul Jacobs wrote to Congressional leaders that any delay in the transition would deny its MediaFLO service to an additional 40 million people due to get access in a planned expansion of the network.