A problem with AT&T’s landline network is the cause for service issues in the Southeastern U.S. that are affecting all four major wireless networks, several telecommunications industry sources told Re/code.
The issue is affecting customers in parts of Tennessee, Alabama, Kentucky and Indiana.
AT&T is the dominant landline provider for the region, and all the major cellular providers use its networks for backhaul — that is, helping transport the data once it leaves their collection of cellular towers.
For its part, AT&T has said its “engineers have pinpointed a hardware-related issue and are working to restore service as quickly as possible.”
Cellular service should resume quickly once the AT&T issue is resolved, the industry sources said.
This article originally appeared on Recode.net.