SoftBank 304HW User Manual page 160

158
Out of Service Notification
Set whether to notify on the web browser when Wi-Fi router is out of network service area.
・ "Turn On" to notify that Internet connection is disabled on the web browser when Wi-Fi router is out of service area.
In Menu List, "Router Setting" "Out Of Service Notification"
➜
"Turn On"/"Turn Off" "Apply"
➜
Setting is made.