Enabling Wi-Fi Calling with T-Mobile on ASUS Zenfone 9

How to Enable Wi-Fi Calling with T-Mobile on ASUS Zenfone 9

Introduction

The ASUS Zenfone 9 and other versions of the ASUS Zenfone series have issues enabling and using Wi-Fi calling when using T-Mobile as their carrier.

Steps

To enable Wi-Fi calling, do the following:

1. Open the Phone App; it works with ASUS or Google phone apps
2. Navigate to the dialer, where you type phone numbers in your phone app
3. Dial this number: *#*#3642623344#*# upon entering the last symbol the number will vanish
4. Close your phone app
5. Open settings and navigate to Network & Internet -> Call -> Wi-Fi calling
6. Toggle the setting off and wait a few seconds before turning it back on
7. You should now see a new icon appear in the status bar, which looks like a Wi-Fi symbol coming out of an old-style phone
8. Done

You’ll have to repeat the steps in this workaround each time you reboot your phone.