[lxgr]

That'll probably remain limited to very low bandwidth data for the foreseeable future. Non-directional, small device antennas just don't provide for enough SNR to support more than a handful of devices per cell.

Starlink has indeed tested a video call to one phone, but you can probably do about 10-30 of these per cell until you max out the capacity (single-digit Mbit/s for everybody in a 15 mile or so radius).

For more, you need active steering and more powerful antenna arrays, which are also larger. Fitting that in a phone will probably take some time, and it might end up being awkward anyway (and slowly cook your hand/ear).