Some AT&T, T-Mobile and Verizon Customers Report Issues With Calls [Update: Fixed]
There appears to be an outage with at least one U.S. cellular carrier, with customers unable to place or receive calls. AT&T, T-Mobile, and Verizon customers have been complaining about the issue on social networks, and there are also reports of outages on the Down Detector website.

According to a statement from AT&T, the outage is affecting calls between carriers in the United States. All of the major carriers are working to restore service.
There is a nationwide issue that is affecting the ability of customers to complete calls between carriers. The carriers are working as quickly as possible to diagnose and resolve the issue.”
Customers affected have been reporting dropped calls and an inability to hear the person they're attempting to communicate with.
Update: AT&T says that the interoperability issue has been fixed, and that it worked with other carriers to solve the problem.
Update 2: T-Mobile has clarified that its network was not down. From a T-Mobile spokesperson: "We are not experiencing an outage. We are seeing Down Detector increases with other providers, so this likely could be challenges our customers are having connecting with users on other networks."
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