Please tell us some basic information before asking for help: Model Name: ASUS ZenFone 9 256 GB/16GB Firmware Version:32.2040.2040.28 Rooted or not: No Frequency of Occurrence: Continual APP Name & APP Version (If your issue relates to the app): The phone, settings In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc. ======================================== I'm using Mint Mobile (T-Mobile MVNO), and Wi-fi calling doesn't work. The option doesn't even present itself in the menu. I find it very hard to believe that a product that markets itself as fully compatible with T-Mobile and its MVNO's doesn't support this basic feature. I was wondering if anyone has found a way to make this work, or is this just an early adoption bug?