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This device is also supported by osmo-qcdiag (to some extent)

Bus 002 Device 022: ID 0af0:6971 Option Globetrotter HSDPA Modem

./osmo-qcdiag-log /dev/ttyHS2

Note: to make sure ModemManager won't interfere with serial interfaces add following rule to /etc/udev/rules.d/69-mblock.rules:

ATTRS{idVendor}=="0af0" ATTRS{idProduct}=="6971", ENV{ID_MM_DEVICE_IGNORE}="1" 

and run
sudo udevadm control --reload-rules

Use /dev/ttyHS0 to enter AT commands to control the device manually:

screen /dev/ttyHS0 115200
AT+CREG=1 #register with GSM network
AT+CGREG=1 #register with GPRS network
AT+CGATT=1 #perform GPRS attach