automatically: As soon as a key is pressed, the receiver is picked up or the telephone is called, the backlight is switched on (brightness max.) and remains in this state afterwards for short transitional period. Otherwise, the backlight remains on a standby level (brightness min.).

Permanently switched on during a call: In addition to the times available in the automatically selection, the backlight remains switched on for the entire duration of a call and afterwards for a short transitional period.