This comes after law enforcement agencies across the US are reported that AT&T customers experienced an outage Wednesday evening.
The National Emergency Number Association, a nonprofit group, said problem shows the need to upgrade technology at 911 centers so calls can be redirected to other regions.
It affected AT&T cellphone customers in several states, including Colorado.
AT&T Wireless experienced widespread outages that affected 911 calls in the Mid-South on Wednesday night.
Pai tweeted about an hour later that AT&T had reported to him that 911 service was restored.
David Haye vs Tony Bellew highlights
Haye and Bellew exchanged angry words and had to be separated by security - but on March 4 there will be no parting them. If Hearn can't get Bellew a title shot, then I see him looking towards a rematch against Haye.
According to the Associated Press, a spokesman for AT&T said that the company is aware of service issues.
He promised to track down the "root cause" of the outage.
Shortly after the issue began around 5:30 p.m. ET emergency service providers in the affected areas began warning residents about the disruption. Most reports originated from New York City, Philadelphia, Washington, D.C., Chicago, Miami, Dallas, Houston, San Francisco, Los Angeles and Seattle.
AT&T is expected to issue a statement once it figures out what caused the outage and how many users it affected.
No. Large-scale 911 outages have happened in the past. However, Longview dispatchers say they have not experienced any reports from local citizens of problems with 911 so far. They offered alternatives for those looking to contact emergency services.