Eurocom M4 - Manual (Page 225)

Troubleshooting
EM820W 3G Module PIN Code & Power-Saving 8 - 17
8
Resolving the “Insert a SIM” issue with the 3G Module (Windows 8.1)
1. If a PIN was set for the EM820W 3G module, you have then switched Mobile broadband off (or put the system
in Airplane Mode) in Networks, and the system has just resumed from a power-saving state the following error
may occur.
2. On resuming from the power-saving state the standard procedure would be to go to Networks in the Charms
Bar and turn on Mobile broadband.
3. Go to the Charms Bar.
4. Select Settings and you will then note that the WiFi icon will read Unavailable.
5. Standard procedure would be to click the connection and enter the PIN number to unlock the connection.
6. In this instance you will note that the Mobile broadband connection will read Insert a SIM.
7. In this case you will need to restart the computer.
8. After system restart you can then connect to the Mobile Broadband as normal.
9. To fully resolve this issue it is recommended that you do not Enable a PIN for the EM820W 3G module.