I am using vi sim my Galaxy M21 but volte is not support please help.

[JuniyarSingh]

I am using vi sim my Galaxy M21 but volte is not support please help.

[Faraz_F34_5G]

Yes
Vi needs to give VoLTE support, only few device support Vi VoLTE.
check screenshot

[RG7397]

VoLTE is working fine in my M21.

[Ehsank]

its vi issues with many devices contact customer care

[Samsung_Support1]

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-network-issues/#:~:text=1%20Check%2....

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support