I mentioned network outages on Monday when I wasn’t able to reach either of my parents, who are both on T-Mobile. Fierce Wireless reports on what happened…

The outages, which started June 15 just after 12 p.m. ET and continued for about 13 hours, were an “IP traffic related issue” that “created significant capacity issues in the network core throughout the day,” according to an update around midnight from T-Mobile CEO Mike Sievert.

Looks like voice and text were down, but not data…

While voice and texting were down, Sievert said data services were working throughout the day, so customers could use apps and services like FaceTime, iMessage, Google Meet, Zoom, and Skype to reach people.

Still, the duration of the T-Mobile’s outage was not insignificant. FCC Chairman Ajit Pai called the outage “unacceptable” and said the agency is launching an investigation.

And it looks like T-Mobile was the issue…

There were complaints that AT&T and Verizon customers were also experiencing problems with service, but both carriers confirmed Monday that their respective networks were working normally. A Verizon spokesperson at the time said it was aware another carrier was having network issues and “calls to and from that carrier may receive an error message.”