According to websites that track outages, Monday saw an increase in service disruptions reported by T-Mobile customers.

According to Downdetector.com, outages peaked at approximately 81,000, up from a baseline of 46. According to feedback on the website, delays have happened in New York, Chicago, Seattle, Phoenix, Houston, Dallas, San Diego, Los Angeles, and Las Vegas.

“This is very irritating. Working, not working, intermittently all night, and it’s still not repaired,” user Jackie said early Tuesday morning.

The corporation has not yet disclosed the exact cause of the outage, although it has stated that a third party was to blame.

Monday night, T-Mobile President of Technology Neville Ray tweeted, “Our teams are rapidly addressing a 3rd party fiber interruption issue that has intermittently disrupted some voice, message, and data services in numerous places.”

Tuesday morning, the corporation reported that the issue had been largely rectified.

Ray tweeted, “We have witnessed a huge improvement and are functioning at normal levels. Our personnel is continuing to monitor the situation, and we sincerely appreciate everyone’s patience. We regret any inconvenience this incident may have caused our consumers.”

Currently, numerous customers are requesting partial refunds on their payments, with some claiming they could not make emergency calls.

Similar regulatory issues plagued T-Mobile in 2021, when the firm paid $19.5 million to settle an investigation over an outage that resulted in 20,000 unsuccessful 911 emergency calls.