How to Enable VoLTE/VoWiFi on Asus Rog Phone 2

In this guide, we will share the instructions to enable VoLTE/VoWiFi on Asus Rog Phone 2. Voice over LTE or WiFi allows you to make and receive calls directly...

Syed Sadique Hassan

Last updated on December 12, 2021

Syed Sadique Hassan

Author

Did his MBA from Delhi but then something about the Android ecosystem intrigued him so much that he made Tech Blogging his permanent job. And now there's no looking back.

Enable VoLTE/VoWiFi on Asus Rog Phone 2

This guide will be divided into four separate sections to make it easier in understanding the steps. But before you go ahead and enable the VoLTE/VoWiFi on your Asus Rog Phone 2, make sure that you have a working DIAG mode. Now head over to the below section and download the required files before you start with the steps.

Downloads

Here are all the files that you will require for this process to complete successfully:

Instructions to Enable VoLTE/VoWiFi on Asus Rog Phone 2

Now that you have downloaded the above-mentioned files, here are the required instructions to enable the VoLTE/VoWiFi on your Asus Rog Phone 2:

STEP 1: Settings Properties

First of all, install the AsusVoLTE app from the above section. Open the app and tap on Enable VoLTE. This will set some properties in the background on your device to make it force enable the VoLTE. If you don’t wish to use the app you could also run the below commands in the adb shell:

setprop persist.vendor.dbg.ims_volte_enable 1
setprop persist.vendor.dbg.volte_avail_ovr 1
setprop persist.vendor.dbg.vt_avail_ovr 1
setprop persist.vendor.dbg.wfc_avail_ovr 1

However, if you are still not able to set these properties because you have reverted back to stock firmware after flashing the mbn file and hence no longer have root, there’s another way out: To make it work, enter the below code in the phone dialer:

*#*#3642623344#*#*

As soon as you enter it, the screen will clear and you shouldn’t see any output if the command is executed successfully. After that, go to Settings > Mobile Network and turn off the mobile data. Turn it back on and you should now see the VoWiFi or VoLTE icon in the status bar now.

STEP 2: Use the EfsTool

Before you begin using the EfsTool, make sure to close the QPST, otherwise, it will conflict with the proper functioning of the tool. This is because two clients cannot be connected at once.
Extract and unzip the EfsTool and open the Command Prompt window. Use the cd command to change directory to the place where you have extracted the tool.
Now depending on how you connect to DIAG, you will have to modify the EfsTool.exe.config file accordingly. For example, if connecting via USB, you won’t have to do much as the tool will automatically find the port.
However, if you are connected via WiFi, the port needs to be changed to 2500 (or the port you have used in the AsusVoLTE app) and remote it to true. In that case, the command will look like:
```
<efstool port="2500" remote="true" baudrate="38400" password="FFFFFFFFFFFFFFFF" spc="000000"/>
```
Finally, test the connection by running the below command in the CMD window:
```
EfsTools.exe efsInfo
```
If there’s an error, try rebooting your device or retry the above-mentioned steps.

Step 3: Disable mcfg

Now extract the efs.zip to the same directory where the EfsTool is present. Also, make sure the mcfg_autoselect_by_uim file is present there. Now open the CMD window and enter the below two commands:

EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o /nv/item_files/mcfg/mcfg_autoselect_by_uim
EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o /nv/item_files/mcfg/mcfg_autoselect_by_uim -s 1

Step 4: Writing MBN

If you have also downloaded the Xiaomi Mi 9T MBNs zip files, move it to the EfsTools directory.
Now find the mbn for your specific carrier. The directory structure for the same should be along this line:
```
<region>/<carrier>/commerci/<country>/mcfg_sw.mbn.
```
Next, copy the mcfg_sw.mbn file to the directory where the EfsTools.exe is present.

Open the Command prompt and type the below command:

EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -v

And if you wish to get it working in the second SIM slot as well, execute this command:
```
EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -s 1
```
You should now see the output, without any error. Now just reboot your device once and once it gets booted, VoLTE/VoWiFi should be fully functional.

Conclusion

With this, we conclude the guide on how to enable the VoLTE/VoWiFi on Asus Rog Phone 2. Share your experiences on the same in the comments section below. And if you face any queries, do drop them in the comments below. With that said, also check out iPhone Tips and Tricks, PC tips and tricks, and Android Tips and Tricks.