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Enable VoLTE on Pixel 6 & 7 with LG U+

Introduction

This document describes enabling VoLTE support on select Google Pixel devices by using Android's internal telephony.ICarrierConfigLoader.overrideConfig(). This patch can be considered as a rootless method of voenabler.

Applying Patch

Requirement

  • Pixel device with Google Tensor Chipset
    • Google Pixel 6
    • Google Pixel 6a
    • Google Pixel 6 Pro
    • Google Pixel 7
    • Google Pixel 7 Pro
  • Windows, macOS or Linux PC with Android Platform Tools installed
  • USB-A to USB-C or USB-C to USB-C cable to connect Pixel to the PC

Installing Shizuku

Shizuku makes possible to call internal Android API without root permission by creating a proxy service with ADB user.

  1. Install Shizuku at the Pixel device you're trying to patch. image-1
  2. Open installed applciation. image-2
  3. Connect your Pixel phone with PC by following this description.
  4. Start shizuku service by executing adb shell sh /sdcard/Android/data/moe.shizuku.privileged.api/start.sh. You should see somewhat like "Shizuku is running" at your Pixel phone. image-3 image-4
  5. Now continue to next section.

Install Patch Application

  1. Click the following link or check out Releases tab of this Github repository to install latest version of PixelIMS application's APK file.
  2. Install downloaded APK file.
  3. Start installed application.
  4. Tap "Allow all the time" when seeing prompt asking for Shizuku permission. image-5
  5. Press "ENABLE VOLTE" button to enable VoLTE (and VoWiFi perhaps). If everything is done right, you should now see toggle right next to VoLTE Enabled by Config text is now flipped. image-6 image-7
  6. Restart your Pixel phone a couple of times until you can see VoLTE is working.

FAQ

I am looking for somewhere to post feedback.

  • Bug report and feature request: Issues
  • Anything else (including general questions): Discussions

Does it also work on any carriers other than LG U+?

AYOR. Tested and checked working only with LG U+.

How do I know if VoLTE is enabled or not?

Flipped System Utilizing VoLTE toggle should be considered as success. image-13

For more information, you can make use of Pixel's internal application. To open it:

  1. Open vanilla Dialer app from your Pixel phone. image-8
  2. Dial *#*#4636#*#*. image-9
  3. Tap "Phone information" menu. image-10
  4. Tap triple-dot icon at the upper right screen then select "IMS Service Status" menu. image-11
  5. You should see IMS Registration: Registered if everything's done well. image-12

Do I have to do this every time I reboot the phone?

No.

Do I have to do this after updating my Pixel?

Not sure.

How does it work?

There is a checker method, ImsManager.isVolteEnabledByPlatform(Context), which determines if VoLTE is possible for your device-carrier combination(ref: googlesource.com). The abstract logic of that method is:

  1. Check if persist.dbg.volte_avail_ovr System Property is true
    • If yes, return true
      • This is how voenabler works
    • Else continue
  2. Check if device supports VoLTE
    • If not, return false
    • Else continue
  3. Check if your carrier supports VoLTE
    • If not, return false
    • Else continue
  4. Check if your carrier requires BGA-capable SIM for VoLTE
    • If not, return true
    • Else continue
  5. Check if GBA bit is active at EF IST
    • If yes, return true
    • If not, return false

This patch alters the bolded logic, by force injecting config values as true regardless of carrier configuration.