Nokia 6750 - Functions Without a SIM Card; Offline Profile

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Security keyguard
The security keyguard requires a 5-10 digit code to protect against unauthorized
use. To change the code and activate the security keyguard, select Menu >
Settings > Phone > Security keyguard.
When the security keyguard is activated, enter the security code if requested.
For more information, see Security keyguard, in “Phone settings” on page 33.
When the automatic or security keyguard is on, calls still may be possible to the
official emergency number programmed into your device.
Offline profile
Important: In the offline profile, you cannot make or receive any calls, or use other
features that require cellular network coverage. Calls may still be possible to the
official emergency number programed into your device. To make calls, you must
first activate the phone function by changing profiles. If the device has been locked,
enter the lock code.
To activate the Offline (also known as flight or airplane mode) profile, select Menu >
Settings > Profiles, and select Offline. When the Offline profile is active, the
connection to the cellular network is closed, but you can listen to music using
the music player. Remember to switch off your device when wireless phone use
is prohibited.
To switch to a different profile, select Settings > Profiles, and another profile. If
your phone continues to ask if you want to go offline, make sure the query is off,
select Menu > Settings > Phone > Offline mode query.
■ Functions without a SIM card
Several functions of your phone may be used without inserting a SIM card
(for example, data transfer with a compatible PC or another compatible device).
Without a SIM card, some functions appear dimmed in the menus and cannot
be used.
For an emergency call, some networks may require that a valid SIM card is
properly inserted in the device.