You can switch the device on with no SIM card inserted, inwhich case the device starts up in the offline mode, andyou cannot use the network-dependent phone functions.To switch the device off, press and hold the power key.Lock the keysWhen the device or keypad is locked, calls may be possibleto the official emergency number programmed into yourdevice.The keypad of your device locks automatically to preventthe keys from being accidentally pressed. To change theperiod after which the keypad is locked, select Menu >Tools > Settings > General > Security > Phone andSIM card > Keypad autolock period.To lock the keys manually in the standby mode, press theleft selection key and *.To unlock the keys, press the leftselection key and *.Tip: To lock the keys inthe menu or in an openapplication, press thepower key briefly, andselect Lock keypad. Tounlock, press the leftselection key and *.Display indicatorsThe device is being used in a GSM network (networkservice). The bar next to the icon indicates the signalstrength of the network at your current location. Thehigher the bar, the stronger the signal.The device is being used in a UMTS network (networkservice).The battery charge level. The higher the bar, thestronger the charge in the battery.17
