No VoLTE options

[TS88]

There is no options to enable VoLTE.

[landsome]

TS88

There is no options to enable VoLTE.

No VoLTE options

Settings -> Network & internet -> Internet -> SIM1

[dron39]

If your cellphone provider doesn't support ZenFone 8 - you won't see such options (VoLTE and/or VoWiFi) in your phone. Put sim-card of different cell provider and you'll see such options there.

[topolov]

Or put your sim card to a different phone

[landsome]

Or put a different sim card in a different phone.