T-Mobile service is down, many US subs are in the dark with no support

T-Mobile’s high-speed, fiber-optic home internet service is down for many users across the US.

Hundreds of reports, spiking at approximately 1AM ET on May 28, read that subscribers have lost connection to the internet.

Is it getting better?

While the volume of reports about the outage had slightly decreased around 3 AM, it has once again risen around 4 AM.

Some say they’ve got some internet connection, but it’s a terrible one; others say they’ve been left in the dark completely.

Some say that specific sites are down for them, but they’ve still got access to X and some other domains:

People blame T-Mobile

T-Fiber used to be Lumos Fiber. Lumos started out as a traditional regional telecom company in the Mid-Atlantic US before switching its focus entirely to building fast fiber-optic internet.

Then, T-Mobile wanted a piece of the action and wanted to offer actual wired home internet (not just wireless 5G) and it teamed up with an investment firm to buy Lumos.

In early 2025, T-Mobile sealed the deal by investing $950 million into a joint venture to take over Lumos’s fiber network. T-Mobile then rebranded this high-speed internet service as T-Fiber and started moving existing Lumos customers over to the new brand. People say Lumos was better:

This is anecdotal evidence, but I’ve had the same experience many years ago, when my local (and small) internet provider was acquired by a nationwide giant company. The service often got interrupted, speeds were trash many times per day.Then, I finally switched and I’m now enjoying fiber speeds. Hiccups still occur occasionally, but not so often.

What happens next?

It’s up to how quickly T-Mobile and its fiber partner can stabilize the network and restore confidence among affected users.

If outages like this continue, it could slow down the momentum behind the T-Fiber rebrand and raise some difficult-to-answer questions. Sure, this kind of early instability is not unusual, but try to explain that to affected users.

For them, the practical advice is to treat this phase as transitional and be prepared for occasional disruptions.

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