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Step 8: Unlock the SIM Card
If the inserted SIM card is PIN locked, a pop-up window is displayed informing you 
that you must unlock the SIM before use.
Click the OK button. The SIM Security page is displayed.
In the Current PIN eld, enter the SIM PIN and then enter it again in the Conrm 
current PIN eld. If you do not want to enter the PIN code each time the SIM 
is inserted, select the Remember PIN option. Click the Save button. After a 
moment, the router displays “Success! The SIM unlock was successful”.