Samsung phone symbol

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Does anyone know what this symbol (highlighted in red at the top) means? I thought it might be a new voicemail message but there's nothing there. My other thought was a missed call, but nothing's showing in the log. (Blocked numbers have appeared in the log so it's not that either).

Any ideas?

I think that's the "WiFi calling" icon

Definitely the Wifi calling icon - I've only got a basic model but love the fact that I have this facility as mobile signal at home is non-existent.

Thanks, both! I would never have guessed that i a million years!