Mobile goes down: What caused Monday’s outage

A post on the company's website said that it was a capacity issue of some sort in the core of the network. Last week, we learned that one million Sprint customers will benefit from " immediate coverage improvement" once their phones will automatically switch to mainly using T-Mobile's network.

T-Mobile and other wireless services experienced outages in the United States Monday afternoon.

T-Mobile customers across the United States were reporting on Monday that they were unable to make and receive calls, and sometimes text messages. Customers also can't call/be called by other providers, leading to reports other providers are down too (they're not). Because of this, it's good to see Ray and T-Mobile be transparent about what caused the outage.

According to a report from The Verge, the problem with calling lies entirely with T-Mobile's network.

Down Detector users also reported issues at AT&T, but a company spokesperson told Digital Trends that the network was still running as normal.

According to an outage tracker Downdetector, complaints started pouring in around 12:30 PM ET and continue through press time. The Federal Communications Commission (FCC), which not long ago approved T-Mobile's merger with rival Sprint despite widely held concerns, has already indicated it plans to investigate how and why the outage took place.

"Thank you for your patience as we fixed the issues", T-Mobile's President of Technology Neville Ray said.

"Our engineers are working to resolve a voice and data issue that has been affecting customers around the country", Ray wrote in a tweet. The problem comes a few months after T-Mobile acquired Sprint Corp. and became the second-largest US wireless carrier by regular monthly subscribers.

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