Q7521040: When I send a test SMS message using my GSM modem, I get the following error: 11202. What does it mean?
This error only occurs when using Windows Telephony devices (like 'Standard 9600 bps Modem'). The error implies that the Windows Telephony device is valid, but that the associated COM port is either already in use, or does not exist. The error does NOT imply that the Windows Telephony device is invalid (that would give error 30201); it neither implies that the Windows Telephony device is already used (that would give error 30204).