Samsung SCH-3550 - Manual (Page 70)

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Your phone provides many security options, including a user-
programmable lock code and call restriction features. To access
the Security menu in Standby mode, press
, , and
then enter the four-digit lock code (normally the lock code is
the last four digits of your phone number). Press the associated
digit key to access one of the following Security options:
1. Lock Phone
2. Limit Use (Phone Book, Incoming / Outgoing, Roaming
calls)
3. Lock Code
4. Special #
5. Erase
6. Reset Phone
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Locking the phone limits all outgoing calls except calls to the
three hard-coded emergency numbers (911, *911, and #911),
the three user-programmable special numbers.
You can lock the phone manually during use, or set the phone
to lock automatically when it is turned on. When the phone is
in Lock mode, you can answer incoming calls, but you must
unlock the phone to place outgoing calls (except to emergency
and special numbers).
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The default lock code for your phone is generally 0000 or the
last four digits of your phone number, depending on activation.
You can enter a personal lock code, and then change the lock
code as often as you like.