Pi Internet - BT Tethering

I want to use my phone as the internet source.

I could get another WiFi dongle for the pi to connect to hotspot, but why not BT tether?

Wired tether works but I'd rather it be wireless.

I seem to be able to pair BT with my phone, and enable tethering. It worked briefly once (I think), but then refuses to connect. I have to repair. Is there a reason it's so unstable? I'm on a S24 Ultra.