Unusual Icon appears

[hachie]

In notification bar, I saw an unusual icon in my Galaxy A21s. It's like a telephone 📞 icon with a WiFi sign over it 

What does it mean?

[kasheph]

This is an icon for "WiFi Calling" feature

[MhassanS]

Jazz activated voice over wifi feature.
If u are connected to good wifi connections your calls will be routed through wifi network.
This feature give HD voice and HD video calling on jazz network