alt Hacker NewsMaybe T-Mobile doesn't need to. I've used their WiFi calling for, what, going on ten years probably. Works a treat, including getting short code SMS. Ergo, I don't know the use case for femtocell for T-Mobile. That's why I was surprised to learn via TFA that WiFi isn't the solution in all cases.
We moved to a T-Mobile femtocell precisely because their wifi calling was absolute shit in our experience. Dropped calls, no group SMS, no SMS/RCS images, frequently no calling service at all. The femtocell fixed all of that for us, and it has remained fixed.