Fault code 4
Symptoms  
SIM card has been improperly changed during an active session. Power down and try again.

Causes
You replaced a SIM card with another after the ThurayaDSL was turned on.

Troubleshooting and Resolution 
The SIM card must be replaced when the unit is turned off. Make sure the unit is turned off before replacing the SIM.

Posted in: Thuraya IP Error Fault Codes