The international roaming outages affecting AT&T, T-Mobile, and Verizon were caused by issues with a third-party vendor, Syniverse, which handles international roaming services for the carriers. The exact cause of the problem has not been disclosed, but Syniverse has been working closely with the affected network partners to restore full service.
Yes, Syniverse is actively working to resolve the roaming issues affecting AT&T, Verizon, and T-Mobile US customers. The company has stated that they are working closely with their network partners to restore full service and appreciate customers' patience during this time.
The roaming outages have been occurring for several hours, affecting AT&T, Verizon, and T-Mobile US customers traveling overseas. The issue stems from connectivity problems at Syniverse, a third-party provider that handles international roaming services for the carriers.