Been trying to track down this problem for months on and off as time allows.
As the title says, internet using cell data works on the phone. Hotspot, when enabled, allows other devices to tether, but no tethered devices has internet access through the hotspot.
A breakthrough today that only makes things more confusing...
In my APN settings, I have an APN called Koodo (editable) and another called Koodo Tether (not editable), and if I delete the Koodo APN leaving only Koodo Tether, internet connectivity through the hotspot comes back.
Of course, by deleting the Koodo APN, I lose 4G and LTE access until I reinstate that APN either manually or by re-loading from default names, however.
(Also, I cannot add “dun” (APN Type under Koodo Tether) to the APN type under the APN Koodo - it says carrier does not allow it; although I can imagine there are very good reasons for this limitation )
What am I missing?