AT&T suffered an outage on August 27, which it has blamed on a software issue.

The outage lasted for around five hours before services were restored by the carrier.

"We’ve resolved a software issue that disrupted the ability of a limited number of our customers to connect to our wireless network,” said an AT&T spokesperson. “We apologize for the inconvenience, and we appreciate our customers’ patience as we worked to resolve this issue.”

According to Downdetector, reports of an outage occurred at around 5:00 pm (ET), before peaking two hours later, with close to 6,000 reports. By around 10:00 pm the number had dropped to nearly normal levels.

The outage is thought to have only impacted some parts of the US, and was not nationwide.

A heat map suggested that New York City, Dallas, Charlotte, Los Angeles, Houston, and Chicago were the cities impacted.

Some users commented on Downdetector that the issue had primarily impacted iPhone users, though this has not been confirmed.

AT&T suffered a partial outage back in February, during which the Federal Communications Commission revealed that 92 million calls were blocked. A couple of days after the outage, the carrier said the outage occurred after it implemented a network change with an equipment configuration error.

Ironically, the carrier only this week agreed to pay $950,000 to the FCC following that outage.

It's not known if yesterday's outage affected calls to 911 services.