VoLTE and VoWiFi Setup on Custom ROMs

Getting VoLTE and VoWiFi working on custom ROMs can be tricky. Here's the complete guide.

Understanding VoLTE/VoWiFi

VoLTE

Voice over LTE - HD calls over 4G network.

VoWiFi

Voice over WiFi - calls over WiFi network.

Why It May Not Work

General Steps

Step 1: Update Firmware

Flash latest stock firmware for your carrier region:

fastboot flash modem modem.img

Step 2: Check Carrier Config

Settings > About > SIM status > check IMS registration

Step 3: Enable in Settings

Settings > Network > SIM > VoLTE/VoWiFi

Carrier-Specific Fixes

India (Jio, Airtel, Vi)

US (T-Mobile, AT&T)

Europe

Advanced Fixes

IMS Settings (Root)

Access hidden IMS settings:

*#*#4636#*#* > Phone Information > IMS Registration

Carrier Config Module

Magisk module to force carrier settings.

Custom ROM Fixes

Some ROMs have built-in VoLTE fixes:

Troubleshooting

IMS Not Registered

Call Quality Issues

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*VoLTE provides better call quality - worth the setup effort.*