As AT&T moves in to start shutting off its 3G service networks in the U.S., people with older devices would no longer be able to use the cellular service on their phones. Any device that is not compatible with the recent 4G/5G standards will not be able to make calls, use data, or even receive messages once the AT&T 3G network is discontinued.
To continue using AT&T wireless services, consider getting a new phone or upgrade with AT&T. Call 855-874-1574 for more information!