The 3G modem appears as a serial device with PPP running on it when it 'on'.
Turn the radio on/off does not have any effect on the Qualcomm SoC or its embedded modem.
It does not have to be 'on' to send/receive AT modem commands.
Keep in mind that the DX (like the K2) does not have any 'rescue' features if you brick it.
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