Per 1) puoi cercare con 'Bluetooth DUN client on Android' o 'Bluetooth tethering on android tablet' verificherai una varietà di risposte e vincoli. Per esempio qui: TetherBridge Bluetooth Tether - BlackBerry è segnalato che:
The standard Android OS from Google does not support bluetooth DUN client service. However, some Android tablets with vendor-specific customizations do support bluetooth DUN client service. For example, most models of the Archos tablets support bluetooth DUN client service. Furthermore, some community Android firmware distributions such as the Cyanogen were rumored to have bluetooth DUN support (not verified by us). If you have an Android tablet with bluetooth DUN client support, you can use our generic guide and reference walk-throughs for other platforms with the highest similarity.
Oppure (anche) questa nota: Android as a Bluetooth DUN Client HOWTO???? - iTethering using Plain old Nokia phone.
Poi non resta che provare, impostando le due modalità tra cell. e tablet.
Per la 2) puoi partire da qui, cioè, proprio Qui:
https://www.androidiani.com/forum/me...m-810c-12.html
Ciao