T-Mobile customers across the United States are experiencing network outages that are preventing them from making calls. The outage, according to T-Mobile representatives, is nationwide and could last for several hours.
A quick Twitter search and a few phone calls from T-Mobile phones confirms that there is a problem. While customers may have signal bars, calls from their phones usually result in a busy signal or a disconnection.
We're going to do some more research on the T-Mobile outage and will update you when we know more.