What network is my laptop using?

The WiFi calling feature allows mobile voice calls to go via WiFi when cellular data strength is very poor.   Using WiFi calling MAY improve call quality or reduce call dropouts in some cases.  Testing at Keysborough in June 2018, suggests that in areas where cellular signal is reasonable (ie. office areas towards the outside of the building), then use of WiFi calling may be a negative.  Whilst in the warehouse, where cellular coverage is presently poor, WiFi calling is definitely beneficial.

Blue cable (or CAT6)

Wifi

Cellular