SIM5218 modem

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Qualcomm, Inc. SIMCom SIM5218 modem

Anyone familiar with this USB device? USB Device ID 05c6:9000 Qualcomm, Inc. SIMCom SIM5218 modem

When I plug it into my Linux laptop I have 5 separate USB tty serial ports show up (/dev/ttyUSB[0-4]).

I can connect to /dev/ttyUSB2 with the following `stty` settings: 460800,cs8,parenb,-cstopb,-hupcl, (460800 baud, 8-bits per character, no parity, and 1 stop bit). I use screen as my terminal emulator. I connect with this command screen /dev/ttyUSB2 460800,cs8,parenb,-cstopb,-hupcl. Once connected I can execute AT commands:

AT
OK
ATA    
NO CARRIER
ATH
OK
ATO
NO CARRIER

On /dev/ttyUSB3 I see the following data printed. This terminal also responds to AT commands. I have not found any interesting AT commands that dump status or state or helpful information.

SMS DONE
+VOICEMAIL: INIT_STATE, 0, 0
PB DONE
+NETOPEN: 0

On /dev/ttyUSB0, /dev/ttyUSB1, and /dev/ttyUSB4 I see nothing printed and they do not respond to AT commands. Perhaps I have the `stty` settings wrong. I did not experiment much. I tried only the same settings that worked on other ports.