I know this is an old thread, but somebody asked above if there was a use case for a internal modem vs a hotspt; I have once stayed in an airbnb that didn’t have wifi, and for some reason, my mifi (hotspot device) was unable to get a signal, but my laptop’s internal modem WAS able to get a signal, with the same sim.
I get that it’s a bit of an edge case but by the same token, if you don’t have a mifi and you’re working on the road, can a mobile phone provide both a hotspot and be used for calls at the same time?