List of tweaks for MIUI/HYPEROS
Carrier USSD Codes
1. Enable VoLTE
On the Dialer Application enter
*#*#86583#*#*
(*#*#volte#*#*)
"VoLTE carrier check was disabled" should appear
2. Enable VoWiFi
On the Dialer Application enter
*#*#869434#*#*
(*#*#vowifi#*#*)
"VoWiFi carrier check was disabled" should appear
3. Enable VoNR ( For 5G capable VoNR supported phones only )
On the Dialer Application enter
*#*#8667#*#*
(*#*#vonr#*#*)
"display vonr switch" should appear
4. Configure VoLTE/VoWiFi/VoNR
Go to SIM Card Settings
Enable Use VoLTE (VoLTE)
Enable Make calls using WLAN, Prefer WLAN (VoWiFi)
Enable Use VoNR (VoNR)
5. Verify configuration
On the Dialer Application enter
*#*#4636#*#*
Go to the Line to configure and verify the settings
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