I wish to connect Raspberry Pi 3B to Tablet WiFi hotspot, then SSH from tablet to Raspberry Pi.
For travelling, I will have a data SIM in Galaxy Tab, so can set up a hotspot.
Connect Pi to the WiFi hotspot.
SSH from Galaxy Tab to the Raspberry Pi, so I can use the Tablet monitor and keyboard on the (headless) Raspberry Pi.
(I already do this, but when both Pi and Tablet are both connected to a network)