How to activate the list of mobile phones supporting VoLTE function in telecom?

Vivo/iQOO series mobile phones, starting from X2 1 series (except Y69 model), all subsequent models support VOLTE.

Y50, S6, iQOO 3, X30, U3x, Y7 1, Y75, Y79, Y8 1s, Y83, Y85, Y93s, Y93, Y97, and Y73 and Y75s.

X20 series, X20Plus series, X20Plus UD series, X2 1 series, X2 1 UD series, X2 1i series, X2 1s series, X23 series and X23 magic color edition series.

Z 1i series, Z3 series, Z3i series, and Z 1, Z 1 Youth Edition, NEX series, iQOO series, iQOO Neo(3) series, Z5 series, Y7s series, NEX3 series and S5 series.

The above models support the telecom VoLTE function, so you can contact the SIM card operator to open the service.