I haven't tried ModemManager yet, but it seems to me that it won't work with a phone plugged into the laptop, unless there is some software running on the phone that acts as a middle-man between ModemManager and the phone's modem.
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If the phone is plugged in a laptop it may happen that it already exposes an "already connected" eth over usb (and therefore ModemManager won't be used) or instead an AT-capable serial port (which ModemManager can use to get a connection).

Aleksander
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