I'm fairly new to GrapheneOS, had it for about a month now. I have been able to make/receive phone calls through Tmobile without cell data turned on since I got on Graphene... I assumed it was because of wifi calling that phone calls are working. So I always leave my data (drop-down menu -> Internet -> Mobile data) turned off when at home.
So today, I walked to the store but forgot to turn data on. I get to the store and while at the store I make a few phone calls...which went through without any issues. Then I get home and realize I had cell data turned off! So, how are calls working if i have cell data turned off??? I have no wifi setup or turned on either except at home
It seems like the data toggle in the internet menu is broken? Or is there something I'm missing? I'm also wondering now if when i make/receive calls at home if its NOT wifi calling...but still using data maybe (while data is turned off). My provider is tmobile. Thanks