While you are waiting for your ISP to answer your question, you can test your 4 umsm(4) devices with cu(1), and at least, find out which is the modem.
If your userid is in the dialer group you can issue these commands as a normal user. Otherwise, you'll need to be the superuser (sudo, su, etc.).
$ cu -l /dev/cuaU0 -s 115200 can be used to initiate a conversation with a modem. If it is listening, and doing so at that baud rate. The ATZ command will issue a "reset" request, and if successful, the modem will reply with an OK message.
To disconnect and return to the shell, in order to test /dev/cuaU1 through /dev/cuaU3, or to test with different baud rate, use a tilde and a period, "~." on a line by itself. If cu(1) fails to recognize it, you can use pkill(1) from another terminal window.
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