S e t t i n g s
restricted lifetime. If "Expired certificate" or "Certificate not valid yet" is shown, even if the certificate should be valid, check that the current date and time in your device are correct.
Before changing any certificate settings, you must make sure that you really trust the owner of the certificate and that the certificate really belongs to the listed owner.
Factory settings — to reset some of the settings to their original values. You need the lock code.
Positioning (network service) — to change positioning settings. See "Positioning settings", p. 31.
Phone
See "Call settings", p. 26.
Connection
Select 
> Settings > Phone sett. > Connection and from the following:
Bluetooth — to switch Bluetooth technology on or off, and edit Bluetooth settings. See "Bluetooth connection settings", p. 79.
USB — to edit USB settings. See "USB connection", p. 80.
Destinations — to define the connection methods used for reaching a particular destination
Packet data — to select the packet data connection settings. The packet data settings affect all access points using a packet data connection.
•To set the device to register to the packet data network when you are in a network that supports packet data, select Packet data connection > When available. If you select When needed, the device uses a packet data connection only if you start an application or function that needs it.
•To set the access point name to use your device as a modem with your computer, select Access point.
•To enable the use of HSDPA (network service) in UMTS networks, select High speed packet access. When HSDPA support is activated, downloading data such as messages,
Data call — to set the online time for the data call connection. The data call settings affect all access points that use a GSM data call.
Video sharing — to set your SIP profile settings manually. See "Video sharing settings", p. 28.
Presence (network service) — to view and edit the presence settings. Connection applications, such as push to talk, use the presence settings. You may receive the settings from your service provider.
SIP settings — to view and edit session initiation protocol (SIP) profiles. See "Video sharing", p. 27.