"AT&T and Verizon Restore Services After Major Call Disruptions"

TL;DR
AT&T and Verizon customers experienced call disruptions across multiple states on June 4, affecting thousands of subscribers. The issue, which began around 11AM ET and peaked at 5PM ET, was resolved by 7PM ET after both companies collaborated to find a solution. The Federal Communications Commission is investigating the root cause, which remains unknown. Despite the disruptions, 911 calls were not affected.
- AT&T, Verizon services restored after call disruption issues across multiple states Engadget
- AT&T customers hit with nationwide service issue Fox Business
- AT&T subscribers struggle to make calls in US outage The Register
- AT&T says customers facing 'interoperability issue' impacting ability to call non-AT&T users has been resolved ABC News
- The AT&T and Verizon outage that cut off phone calls is over The Verge
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