The biggest U.S. mobile operators, AT&T Wireless and Verizon Wireless, will close down their analog networks on Monday.

PC World
Friday, February 15, 2008; 12:19 AM

You may think of sunsets as something nice to look at, but if you have an older cell phone or a home alarm system, there's one coming up on Monday that may not be so pretty.

That day, the U.S. Federal Communications Commission will let mobile operators shut down their analog networks. It's called the "analog sunset" because those AMPS (Advanced Mobile Phone System) networks, which were first deployed in the 1980s and brought cellular service to millions of Americans, will finally disappear behind the digital networks that serve almost all mobile phones in use today.

The biggest U.S. mobile operators, AT&T Wireless and Verizon Wireless, will close down their analog networks that day. At the same time, AT&T will turn off its first digital network, which uses TDMA (Time-Division Multiple Access) technology. (Sprint Nextel and T-Mobile USA don't have analog networks.) Calls to some small, rural mobile operators indicated that most of them plan to shut down AMPS, too.

Click here for the entire story.

Monday, October 22, 2007

ATT Accuses Vonage of Violating VoIP Patents

America’s leading telephone operator, ATT Inc., filed an intellectual property lawsuit against the troubled VoIP provider, Vonage Holdings Corp yesterday, seeking damages for alleged patent infringement.

AT&T’s lawsuit, filed at a U.S. District Court in Wisconsin, alleges that Vonage willfully violated an ATT patent concerning telephone systems that allow customers to make VoIP calls using standard telephone equipment.

AT&T claims that it tried to reach a licensing agreement with Vonage, but was unsuccessful, forcing it to file suit against its smaller competitor.

This latest legal woe comes just days after Vonage settled a similar dispute with wireless carrier, Sprint Nextel, for $80 million. Vonage is also fighting a losing battle against New York-based telephone giant, Verizon Communications, to which it lost another massive patent infringement suit earlier this year.