Upated: AT&T suffering outage that has affected all operators

• All the major carriers in the U.S. have suffered from problems this morning, following an AT&T outage

• Thousands of customers are cut off from their cell service

• 911 services also impacted

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AT&T is suffering from a nationwide outage that has affected customers at T-Mobile and Verizon as well. It is not clear yet what has caused the disruption.

Thousands of customers are reporting no connection to their service. 911 services are also reportedly affected.

Service disruptions have been reported in various cities including Boston, Chicago, New York, San Francisco, Washington, Honolulu, Atlanta, Houston, Dallas, Los Angeles and Seattle.

“Some of our customers are experiencing wireless service interruptions this morning. We are working urgently to restore service to them. We encourage the use of Wi-Fi calling until service is restored,” AT&T said in a statement.

"Our network teams took immediate action and so far about three-quarters of our network has been restored. We are working as quickly as possible to restore service to remaining customers,” an AT&T spokesman added this afternoon.

"Verizon's network is operating normally," a Verizon spokeswoman told us. "Some customers experienced issues this morning when calling or texting with customers served by another carrier. We are continuing to monitor the situation."

"We did not experience an outage. Our network is operating normally," a spokeswoman from T-Mobile told us. [Any problems are] likely reflecting challenges our customers were having attempting to connect to users on other networks."

We'll add further updates as we get them, stay tuned!