Wi fi calling drops out regularly

[Indyana]

Evening people.
Would really like to understand why we do calling icon at top of screen keeps dropping out every minute, as I am at home in WiFi which I believe is OK. I got this wi fi calling phone Samsung A51, a month ago. to benefit a poor signal area. It seems ineffective.
Thoughts please or any advice appreciated?
Cheers

[MI5]

@Indyana 

Do you have wifi calling enabled on your account and turned on in your phone settings?

https://www.o2.co.uk/connectivity/wifi-and-4g-calling

[BOSSGOGG]

If you have followed the good advice above to make sure your device is up to date and WiFi calling is enabled on your account -

I don't have a A51 in the house but do have half a dozen Samsung's going back to a Xcover 4s. Make sure WiFi preferred is enabled over mobile network preferred. All my Samsung's have this option. Without it, it shall constantly latch onto half a bar of cell signal.
Quick test, stick it into plane mode and re enable WiFi manually, same issue?