Nokia 2135 - Manual (Page 41)

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Network services
Displays available network services and their settings. For
the network service availability, please contact your
service provider.
Select Menu > Settings > Network services , and one of
the following options:
Network feature setting —to activate network services in
the phone by using feature codes received from your
service provider.
Own number selection —to activate network services in the
phone by using a number you have selected.
Restore factory settings
You can restore the original factory default settings
without affecting personal data such as contacts,
language selection, or calendar notes.
1. Select Menu > Settings > Restore factory settings .
2. Enter your security code and select OK .