AT&T's 3G Network Is Going Dark, Meaning Some Devices May No Longer Work

AT&T will become the first mobile carrier to shut down its 3G network next week, which will affect more than just cell phones.

As companies begin to favor newer 5G networks, 3G is beginning to be phased out, starting with AT&T on February 22, the Associated Press reported. According to the Federal Communications Commission, carriers like T-Mobile and Verizon will be close behind, looking to end their 3G networks before the end of the year.

This will have an impact on more than just people with older cell phone models. The FCC's release said home alarm systems, medical devices, vehicle SOS services and even law enforcement monitoring devices could also be affected.

The FCC said shutting down networks like this is customary for mobile carriers, as the same happened when carriers shut down 2G to support 4G services. They shut down the services to free the "spectrum and infrastructure" for the newer services.

"Mobile carriers have the flexibility to choose the types of technologies and services they deploy, including when they decommission older services in favor of newer services to meet consumer demands," the FCC said.

According to the AP, about half a million medical alert devices are still using 3G, with most of them specifically using AT&T. An alarm-industry lobbying group told the AP an estimated 1.5 million people have not upgraded their fire and burglar alarms that run on 3G. According to the report, the alarms will still sound even if not connected to a network, but they will not be able to automatically contact emergency services.

CNBC reported the shutdown could also affect a dozen models of cars released between 2010 and 2021. Some still use 3G for navigation services, smartphone connectivity and emergency calling services. According to the report, those driving Honda, Nissan or Volvo models should act quickly, as the companies are partnered with AT&T.

Another concern is that many ankle monitors for those on parole, probation or awaiting trial also rely on 3G. A September 2021 court filing from manufacturer Alcohol Monitoring Systems, Inc., said shutting down 3G could allow "potentially tens of thousands" of child abusers, sex offenders, drug dealers and more to go unmonitored, increasing the possibility they will "commit dangerous acts without detection."

According to the AP, despite many arguments against shutting down 3G, AT&T insisted on it because not shutting it down would hurt its 5G rollout. The company also argued the affected companies had years to upgrade their technologies.

The FCC urged people who still have devices using 3G to contact their mobile carriers as soon as possible. AT&T has provided a list of devices that will continue to work after its 3G is shut down.

Update 02/15/22 12:50 p.m. ET: This story was updated to add more information.