The Federal Communications Commission (FCC) is inviting public comments on the

which lasted over half a day. Government agencies, public safety entities, businesses, and people in general can submit comments until 8 July. 

In a public notice, the FCC said it was looking for a number of answers. "Are there estimates of how many calls, including 911 calls, failed or otherwise affected by the outage? What was the effect of the outage on public safety activities and government services across the country? Was there a disruption of data services relied on by public safety entities and state and local governments?" 

The commission also wants to know how people and organisations learned about the outage, and did they feel T-Mobile US' communication was “appropriate, timely, and effective.” 

The FCC in addition asked if parties were able to use other types of communication, such as FaceTime, iMessage, Google Meet, Google Duo, Zoom, Skype and others, to connect during the outage, and were the method of communication successful and effective. Finally, the commission asked what effect did the outage have on businesses and providers of critical services, such as hospitals, and also on the personal activities of people of general.

T-Mobile US attributed the outage to a leased fibre circuit failure, which got overloaded after a redundancy failure. The IP traffic “storm” then spread out from the Southeast where it started, creating capacity issued across the IMS core network that supports VoLTE calls.