For the EpiValley modem, with Starcomms, and probably any other network. The title says Starcomms simply because Starcomms seems to be most fond of the device.
And yes, this should apply to any recent Linux distribution even. I use ubuntu, so here goes.
All you need to do is install usb-modeswitch (it’s in the ubuntu repositories), then remove the device if it was already plugged in, and plug it back in. Network manager will show it as an available mobile internet device.
It’s as easy as that.