BT workers and Openreach engineers will stage a fresh strike on Thursday in a long-running dispute over pay.
The Communication Workers Union (CWU) said its members working as 999 emergency call handlers will also walk out, warning of disruption to emergency services.
Around 30,000 Openreach engineers and 10,000 BT call centre workers have already taken industrial action, and further strikes are planned for October 10, 20 and 24.
