Nokia N81 - Manual (Page 129)

Settings
129
Internet calls are not possible without the SIP profile and
SIP settings.
Configurations
You may receive trusted server settings from your service
provider in a configuration message. You can save, view, or
delete these settings in
Configurations .
Access point name control
With access point name control service, you can restrict
packet data connections and allow your device to use only
certain packet data access points.
This setting is only available if your SIM card supports the
access point control service.
To set the control service on or off or to change the
allowed access points, select
Options and the
corresponding option. To change the options, you need
your PIN2 code. Contact your service provider for the code.
Applications
To edit the settings of some of the applications in your
device, press
, and select Tools > Settings >
Applications . The settings are also available in each
application by selecting the settings option.