BELLEVUE, Wash. – The head of the FCC says Bellevue-based T-Mobile’s nationwide, hours-long outage Monday was “unacceptable” and that the Commission will investigate.

The FCC has fined telecom companies in the past for network outages.

T-Mobile said it had a “voice and text issue” that began around noon eastern time.

The company said 13 hours later that all problems had been resolved, blaming an internet traffic issue that caused problems with its network.

AT&T and Verizon said their networks were working normally.

The FCC is launching an investigation.