AT&T is moving closer to retiring its copper phone network in California after FCC approval for the next phase affecting roughly 184,000 customers. Copper service can continue until it’s discontinued on or after June 1, 2027, with customers transitioning to AT&T Phone-Advanced (fiber or wireless-based) that aims to remain compatible with home phones, fax, security systems, and medical monitoring. Dealers should prepare a compatibility checklist and offer backup connectivity.