I think the rest are used for other features: one is a control interface, so one can check the signal strength while using the main modem device, and if using the S720/related devices, an interface to the built-in GPS receiver. I’ve not figured out how to use either of these yet.
He is also co-founder of a web services company based in his hometown, Rhombic Networks, LLC, where he currently serves as CTO, system administrator, and programmer.
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Modem is /dev/ttyUSB0
The modem is the first device, /dev/ttyUSB0.
I think the rest are used for other features: one is a control interface, so one can check the signal strength while using the main modem device, and if using the S720/related devices, an interface to the built-in GPS receiver. I’ve not figured out how to use either of these yet.