Unlocking the GSM 3G Wireless Modem

The subscriber identity module (SIM) in the GSM 3G wireless modem card is a detachable smart card. Swapping out the SIM allows you to change the service provider network, however some service providers lock the SIM to prevent unauthorized access to the service provider's network. If this is the case, you will need to unlock the SIM by using an personal identification number (PIN), a four-digit number provided by the service provider.

Use the CLI operational mode command to unlock the SIM on the GSM 3G wireless modem card.

This example uses the PIN 3210 from the service provider.

To unlock the SIM on the GSM 3G wireless modem card:

A SIM is blocked after three consecutive failed unlock attempts; this is a security feature to prevent brute force attempts to unlock the SIM. When the SIM is blocked, you need to unblock the SIM with an eight-digit PIN unlocking key (PUK) obtained from the service provider.

Use the CLI operational mode command to unblock the SIM.

This example uses the PUK 76543210 from the service provider.

To unblock the SIM:

Note: If you enter the PUK incorrectly ten times, you will need to return the SIM to the service provider for reactivation.