Verizon Restores U.S. Voice Service by 7:19 p.m. After Wireless Calling Outage

Q: What hidden core software failure caused Verizon's massive blackout across the East Coast, leaving thousands completely disconnected?

Verizon has not publicly identified a confirmed root cause for Saturday’s East Coast-heavy outage, so any precise explanation remains unverified. The strongest expert theory, based on a previous major Verizon disruption, is a failure in core network software tied to the company’s 5G Standalone core during a feature update or minor configuration change. Telecom analyst Roger Entner told CNET in that earlier case that it “looked like” Verizon’s 5G SA core went down during a minor feature change, a type of software failure that can cascade quickly across multiple markets and leave phones stuck in SOS mode or unable to place calls. That theory fits the pattern seen Saturday: a broad, multi-city service problem affecting voice and in some places data, text and wireless home internet, especially along the New York-to-Washington corridor. Industry experts note that outages spread across many cities at once are more often linked to centralized core software, routing, or signaling failures than to cell tower problems. But there is an important caveat: Verizon’s own statement on Saturday said only that it was dealing with a voice-services issue and that engineers were working to identify and resolve it. The company did not say there was a software bug, failed update, routing error, or cyber incident. So the hidden failure was most likely a core network software or signaling problem—possibly in the 5G Standalone core—but that has not been officially confirmed for this outage.

3 articles · Updated · WRAL News · Aug 9

7:19 p.m. marked Verizon’s resolution of a voice-service outage that left some U.S. wireless customers unable to make phone calls, with the carrier later saying its network was operating normally.
Verizon had told users on X that engineers were investigating an issue affecting voice services in some parts of the country after complaints spread online.
North Carolina reports illustrated the disruption: a Nashville customer said his Verizon phone was affected, while his daughter also had trouble using AT&T in Wake County.
The outage followed a broader day of telecom service problems, after Downdetector logged more than 10,000 Verizon reports Saturday afternoon and other providers also saw issues.