To be clear, the
Avata requires the location of the control station to be compliant with RID, it does not require a cell phone. A tablet with GPS and no cellular radio running DJI Fly will do just fine.
Or, the Integra
goggles, which have GPS built-in. No attached device is necessary at all.
So the connected cell phone on the
Avata with the
Goggles 2 or
Goggles V2 is simply an implementation convenience to obtain GPS, nothing more. LTE and cellular networks or service play no role at all in DJI's design decision to leverage GPS capability in cell phones.
I believe that's already the case, there's no "may" about it. When I (used to) fly my
Mavic 2 Pro I ran GO4 on my cell phone, connected to the RC. GO4 continously knew where I was, in addition to the aircraft, throughout the flight.