Audiovox GSM 900 system - Manual (Page 52)

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Press key, and the numbers will appear on the screen.
Set Status (6-3-2)
Switch on/off the Fixed-Dial function.
After you enter this function by pressing key, press key to
select “On” or “Off” and press key to confirm.
Modify (6-3-3)
You can add or change records of your fixed-dial numbers.
Press key, and the numbers will appear on the screen. You can press
key again to add, edit or delete numbers.
SIM Lock (6-4)
With this function, you can prevent unauthorized usage of the handset with
unknown SIM cards.
After you set this function ON, if the SIM card in your handset is not the one
used to enable this function, you will be prompted to enter the unlock code
when you power on your handset. If the unlock code entered is correct, the
handset will recognize the SIM card automatically. The next time you power on
your handset with this newly recognized SIM card, you will not be prompted to
enter the unlock code again. However, if the unlock code entered is incorrect,
the display will show “Insert Correct SIM”, and the handset will function as if
the SIM card was not inserted. The handset can recognize up to 3 different SIM
cards. After you enter this function by pressing (or ) key, the following
options will appear on the screen: