Cellular data got blocked with the installation of Symantec Endpoint Protection (SEP) Mobile app
SEP Mobile Console with Security Gateway [WSS] integration
Mobile devices using "Telstra " cellular data service.
The service provider "Telstra" on the mobile device uses only IPV6, and SEP mobile had Security Gateway [WSS] integration through the Policy to Block IP v6 Traffic
Reconfigure the Security Gateway [WSS] policies to allow IPV6 traffic.