Hi there! As the visa is electronically attached to your passport it is checked and validated automatically when the passport is scanned.
My experience was this; after arriving at Melbourne airport I approached the long line for immigration. To my left though were those automatic gates that can be used if you have a biometric passport. Knowing that may passport had a chip in it, and totally forgetting that I really needed conformation that my spousal visa was indeed valid by an official, I scanned my passport, the machine took a picture and the gates opened with the display message 'Welcome to Australia'. I followed the signs to baggage reclaim, where my bags were already there and then onwards to boarder control. I gave my card that I filled out on the plane stating that I didn't have any Marmite on me, and was directed to a lane that ended with an opaque glass panel which moved aside as I approached and straight in to the arms of my wife and kids who had been in Australia for a few months previously. Very impressed.
It was only in the car to my new home that I suddenly thought ' oh hang on'!
Anyway, a nice Scottish lady did confirm that my visa was valid when getting my Medicare card a few weeks later.
Hope this helps and enjoy.
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