An international roaming service outage is causing problems for cellphone users traveling overseas, with AT&T, T-Mobile US and Verizon Communications saying they were working to resolve the issue.

Verizon Support said in a social media post that its teams are “actively working with local providers to resolve the issue,” noting that some customers traveling abroad “may be experiencing issues making calls.”

T-Mobile told The Atlanta Journal-Constitution it is “one of several providers impacted by a third-party vendor’s issue that is intermittently affecting some international roaming service. We’re working with them to resolve it.”

AT&T said its network is “operating normally.”

“Some customers traveling internationally may be experiencing service disruptions due to an issue outside the AT&T network. We’re working with one of our roaming connectivity providers to resolve the issue,” according to a spokesperson.

People traveling abroad took to social media to report disruptions.

Bloomberg and the technology website 9to5Mac reported on the problems affecting the three major U.S. carriers Thursday morning.

Verizon said in a statement to Bloomberg that there is an issue with a “third-party communications provider” for its customers’ voice and data connections for U.S.-based customers using their mobile devices outside the country.

-This is a developing story and will be updated. Return to ajc.com.

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