American cell phone users are currently dealing with wide outages on the networks of AT&T, Cricket, Verizon, T-Mobile, and other service providers, according to Downdetector.

AT&T was reportedly the hardest hit and is actively working to restore service to its consumers. The company, the largest in the United States, had more than 58,000 outages in Houston, Atlanta, and Chicago.

The outages are said to have begun around 3:30 am EST and peaked at approximately 73,000 incidents. 

iPhone users who are customers of AT&T reportedly saw SOS messages displayed in the status bar of their cellphones. The messages indicate the devices had trouble connecting to their provider's network.

However, they were still able to make emergency calls through the networks of other carriers, according to Apple Support.

AT&T has more than 240 million subscribers. AT&T had more than 58,000 outages around noon ET in locations including Houston, Atlanta, and Chicago.

The AT&T outages, which began at approximately 3:30 a.m. EST, peaked at around 73,000 reported incidents.

The carrier has more than 240 million subscribers, the country's largest.

"Some of our customers are experiencing wireless service interruptions this morning. Our network teams took immediate action and so far three-quarters of our network has been restored. We are working as quickly as possible to restore service to remaining customers," AT&T and Cricket said in a statement.

Cricket is owned by AT&T and reported 9,000 outages, while Verizon reported more than 2,000 outages, and T-Mobile reported 1,400. Boost Mobile reported 700 outages in the same time frame. 

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

However, T-Mobile said that it did not experience an outage.

"Our network is operating normally. Down Detector is likely reflecting challenges our customers were having attempting to connect to users on other networks," T-Mobile said.

So far, no reason has been given for the outages.