The expansion is a big step towards broader 5G adoption throughout the country — you’ll probably want to be able to connect to a 5G network when you pick up a 5G-ready phone, after all. T-Mobile says it’s working with OnePlus, Qualcomm and Samsung to make sure compatible devices can access the standalone 5G network after a software update.

“Since Sprint became part of T-Mobile, we’ve been rapidly combining networks for a supercharged Un-carrier while expanding our nationwide 5G footprint, and today we take a massive step into the future with standalone 5G architecture,” Neville Ray, T-Mobile’s president of technology, said in a press release. “This is where it gets interesting, opening the door for massive innovation in this country — and while the other guys continue to play catch up, we’ll keep growing the world’s most advanced 5G network.”

Our engineers are working to resolve a voice and data issue that has been affecting customers around the country. We’re sorry for the inconvenience and hope to have this fixed shortly.

— Neville (@NevilleRay) June 15, 2020

While there were also smaller outage report spikes for Sprint (which has merged with T-Mobile), AT&T, Verizon (Engadget’s parent company) and US Cellular, the issue seems to be only on T-Mobile’s side. Spokespeople for AT&T and Verizon told Engadget their networks are working just fine.

interesting update: i’ve just been told that *one network* (appears to be TMO, waiting for confirmation) is having an issue, but because other people are calling people on that network, they think the issue is on their end, which is why downdetector looks like this

— Mike Murphy (@mcwm) June 15, 2020

According to Mike Murphy of Protocol, the spikes for other providers may have been caused by people on other networks calling T-Mobile phones, failing to get through and believing the problem was on their end. The outage maps for each provider on Down Detector seem to back up that notion, as the hotspots are in similar parts of the country.

It’s not clear as yet exactly how widespread these issues are, what caused them and when they might be resolved. Engadget has contacted all of the affected companies for comment.

Update (5:49 PM ET): T-Mobile’s customer service account on Twitter confirmed the problem, calling it a “widespread routing issue” and recommending subscribers try third-party services like FaceTime or Signal in the meantime.

Update (6/16 12:25 AM ET): The outage is still unresolved, however T-Mobile CEO Mike Sievert has issued a statement saying “We are recovering from this now but it may still take several more hours before customer calling and texting is fully recovered…This is an IP traffic related issue that has created significant capacity issues in the network core throughout the day. Data services have been working throughout the day and customers have been using services like FaceTime, iMessage, Google Meet, Google Duo, Zoom, Skype and others to connect.”

The CEO confirmed the issue has been going on since shortly after noon ET, and with a national issue stretching more than twelve hours, it has attracted quite a bit of attention. That includes the eye of FCC chair Ajit Pai, who tweeted “The FCC is launching an investigation. We’re demanding answers—and so are American consumers.”

Update (6/16 1:22 AM ET): According to T-Mobile president of technology Neville Ray, “Voice and text services are now restored.”

Voice and text services are now restored. Thank you for your patience as we fixed the issues. We sincerely apologize for any and all inconveniences.

— Neville (@NevilleRay) June 16, 2020

The T-Mobile network outage is unacceptable. The @FCC is launching an investigation. We’re demanding answers—and so are American consumers.

— Ajit Pai (@AjitPaiFCC) June 16, 2020

Our engineers are working to resolve a widespread routing issue affecting voice & text. Customers may experience longer care wait times. Please try third-party calling apps (FaceTime, WhatsApp, Signal) as a temp solution.

— T-Mobile Help (@TMobileHelp) June 15, 2020