The SOP
1. At push back all devices to airplane mode
2. At over 10,000 feet if fitted enable WIFi service
3 If WiFi is fitted crew will make PA when available and overhead sign relating to devices has gone out
4. If aircraft is NOT WiFI fitted then airplane mode throughout
5. Below 10,000 feet airplane mode
6. If a CAT3 landing is planned all devices powered OFF
7. After landing once clear of all active runways, airplane mode off at captain discretion (two bongs on PA)