Please check the following:
- Is the SIM inserted correctly?
- Is the hardware/device powered up correctly?
- Have you configured the correct APN?
- If possible check the devices SIM status (menu, GUI, LED ,…), or by issuing the AT command AT+CPIN? The +READY response generally rules out a hardware issues, and an +ERROR generally indicates that there is a hardware/device interoperability issue
Check that the SIM status online:
- Login to M2M One Control Centre
- Search for the SIM (by ICCID, Serial Number, ...)
- Check that the SIM status is either "Test Ready", "Activation Ready", or "Activated". Any other status will prevent SIM from working
For further troubleshooting and assistance please contact M2M One Support.