Flight modeUse the flight mode in radio sensitive environments—on board aircraft or in hospitals—to deactivate all radio frequency functions. You still have access to offline games,calendar, and phone numbers. When the flight mode is active, is shown.To activate or set up the flight mode, select Menu > Settings > Profiles > Flight >Activate or Personalise.To deactivate the flight mode, select any other profile.Emergency call in flight modeEnter the emergency number, press the call key, and select Yes when Exit flightprofile? is displayed.Warning: With the flight profile you cannot make or receive any calls, includingemergency calls, or use other features that require network coverage. To make calls,you must first activate the phone function by changing profiles. If the device has beenlocked, enter the lock code. If you need to make an emergency call while the device islocked and in the flight profile, you may be also able to enter an official emergencynumber programmed in your device in the lock code field and select 'Call'. The devicewill confirm that you are about to exit flight profile to start an emergency call.Keypad lock (keyguard)To prevent accidental keypresses, select Menu, and press * within 3.5 seconds to lockthe keypad.To unlock the keypad, select Unlock, and press * within 1.5 seconds. If Securitykeyguard is set to on, enter the security code if requested.To answer a call when the keypad is locked, press the call key. When you end or rejectthe call, the keypad automatically locks.Further features are Automatic keyguard and Security keyguard. See"Phone," p. 34.When the device or keypad is locked, calls may be possible to the official emergencynumber programmed into your device.Functions without a SIM cardSome functions of your phone may be used without installing a SIM card, such as musicplayer, radio, games, and data transfer with a compatible PC or another compatibledevice. Some functions appear dimmed in the menus and cannot be used.3. CallsYour phone can make and receive calls using a cellular mobile phone network or a Wi-Fi WLAN for voice calls over the internet. See "Wi-Fi/WLAN connection," p. 29.C a l l s© 2007 Nokia. All rights reserved. 17