T-Mobile experienced a widespread service outage on August 14, 2026, affecting major U.S. cities. Customers in Chicago, New York City, Los Angeles, Houston, Philadelphia, and Dallas reported failed calls and data disruptions. Many users saw their devices lose all connectivity or enter SOS mode.
This event follows a previous large-scale outage on July 27 that impacted tens of thousands of customers. T-Mobile has not yet issued a formal statement explaining the cause or scope of the current service failure.
Wolfe Research downgraded T-Mobile (TMUS) stock from Outperform to Peer Perform on the same day.