Audiovox GSM 900 system - Manual (Page 51)

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PIN2 (6-2-2)
What is PIN2?
PIN2 is a second set of PIN that is mainly used to control limited services such
as call cost limitation and fixed dialing numbers.
You can change PIN 2 the same way as described in 6-2-1.
Phone Code (6-2-3)
You can change your phone code the same way as described in 6-2-1.
Network Password (6-2-4)
You can change the network password the same way as described in 6-2-
1.