T-Mobile said on Wednesday that a software glitch was to blame for aon Tuesday that left unable to send or receive calls or text messages.
"After investigating the cause, we have determined that a back-end system software error had generated abnormal congestion on the network," T-Mobile said in a statement. "T-Mobile has since implemented additional measures to help prevent this from happening in the future."
The wireless service provider did not say which software caused the issue.
"We again apologize to those customers who were affected and may have been inconvenienced," T-Mobile said. I've also asked the carrier what, if any, compensation it plans to give those who were without service.
The service disruption began on Tuesday afternoon and lasted, for some, until late into the evening Pacific Time.
T-Mobile has stated that the outage affected about 5 percent of its users.