Reports are flooding in that point to a rather serious T-Mobile network outage in the northeast US. It sounds like most metro areas in that region are affected including New York, Boston, and Washington DC. The carrier is aware of the issue and is working on a fix.

2015-02-13 14_55_49-T-Mobile USA down_ Current outages and problems _ Down Detector

Customers in the affected areas are seeing a variety of issues. Some are simply unable to connect to LTE, while others are stuck on EDGE. LTE service is reportedly intermittently working in a few locations as well. John Legere himself devoted a whole tweet to addressing the issue without poking fun at any of the other carriers. It's not really the best time, obviously.

Hopefully they sort everything out soon. We'll update you when there's any change.

All systems normal, captain

T-Mobile has announced service is fully restored. Fire up your LTE and check it out.