(Reuters) - Major U.S. telecom service providers said on Thursday some of their users traveling overseas were having connectivity problems due to an issue at a partner network provider.
In statements to Reuters, Verizon (NYSE:VZ), AT&T (NYSE:T) and T-Mobile US (NASDAQ:TMUS) said they were working to resolve the issue but did not provide details on the extent of the outage or the services partner responsible for it.
However, a person familiar with the matter said it was due to a glitch at Syniverse, a telecom services firm that works with global carriers to support international roaming.
In a response to Reuters, Syniverse said its systems were facing "intermittent connectivity issues" and was working with its network partners to fix the problem.
Verizon said 70% of its customers' calls and data connections were currently going through, while it worked to resolve the issue.
AT&T said its network was operating normally and some customers traveling overseas were experiencing disruptions "due to an issue outside the AT&T network".