Hello,
Please confirm the statements below:
1. Is the device in a Deep Sleep mode?
2. Are there any authorized numbers set? If so, are you sending SMS commands from the authorized number?
3. Are there no SMS logins and SMS passwords set?
4. Obviously, is the device turned on?
5. What is the firmware version of your device?
Please attach a log file of at least 10 minutes when your are attempting to send an SMS message to your device if possible.
Regards,