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Cellular modem options

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I have a Kyocera 2035a that I want to use a cellular modem - my problem is that whenever I have it connected to my laptop or project board the incoming call is rejected with the mesage "All circuits are busy"

If I disconnect the serial cable, the call arrives and is answered by the modem. if I plug the cable back in I get "All Circuits Busy" again.

Can anyone advise me on the correct config of the kyocera?

Or recommend a different cell modem that I can plug into a serial port?
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