AT&T confirms service outage, but Verizon, T-Mobile say their networks are running fine

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AT&T Inc. confirmed “wireless service interruptions” that were affecting some of its customers Thursday morning, following user reports of outages.

Tens of thousands of AT&T
T,
-2.26%

users had flagged service disruptions on Downdetector shortly after 11 a.m. Eastern time. AT&T said it took “immediate action” to address the issues and that service on three-quarters of its network has now been restored.

“We are working as quickly as possible to restore service to remaining customers,” an AT&T spokesperson said.

The carrier advised earlier Thursday that users should turn to wifi calling until the problems are fixed.

Shares of AT&T were off more than 2% in morning trading Thursday.

While customers of Verizon Communications Inc.
VZ,
-1.27%

and T-Mobile US Inc.
TMUS,
-0.43%

also flagged service issues on Downdetector, those carriers suggested that reports from their customers were due to problems contacting customers on AT&T’s network.

“Verizon’s network is operating normally,” a spokesperson said. “Some customers experienced issues this morning when calling or texting with customers served by another carrier.”

T-Mobile “did not experience an outage,” a spokesperson there said. “Our network is operating normally.”

Shares of Verizon were down about 1% in Thursday morning action, while T-Mobile’s stock was off fractionally.