Bye Bye TDMA

at&t Wireless and Alltel finally are shutting down their old analog and first-generation cellular (TDMA) networks in February 2008. Verizon Wireless says on its Web site that it will retire its analog network on Feb. 18, 2008, and will not provide analog service after that date.

Almost nobody will notice. The carriers say a million phones out of 250 million in use might be affected. No phone capable of text messaging uses analog technology. No Sprint or T-Mobile phones use analog, either.

Carriers have been telling analog customers about the shutdown and offering them new digital service plans and phones, so it isn't clear that any active users will experience issues. There might be some "phones sitting in drawers" that users keep around for emergency 911 calling, without plans, that could be affected.

But at&t, which had the largest number of analog customers at one time, has been phasing analog out since 2001, and with the high rates of phone replacement, can't still be supporting many users on the older system.

Separately from the analog shutdown, Alltel and AT&T will finish phasing out networks that use a first-generation digital technology known as D-AMPS or TDMA (for Time Division Multiple Access).