ZTE MF75 - Manual (Page 5)

MobiiConnect 4G Manual 5
LED indicators guide
Wi-Fi Status Light Meaning
Not Lit Wi-Fi is Off. Use Web Management page to turn back on
Blue solid WPS (Wi-Fi Protected Setup) is active
Blue blinking Wi-Fi is active
4G Status Light Meaning
Red Offline, not registered on a mobile network
Green solid Registered on 3G or 2G network
Green blinking Active data transfer on 3G or 2G network
Blue solid Registered on 4G network
Blue blinking Active data transfer on 4G network