Customising Your Devicenüvifone A50 Owner’s Manual 103• Hearing Aid Mode—optimises thephone speaker for use with hearingaids.• Fixed Dialling Numbers—enablesyou to set up your device so thatit can only dial certain phonenumbers (page 103).• Network operators—searches forlocal networks.Enabling and Adding FixedDialling numbersTo change Fixed Dialling Numbers(FDN) settings, you must acquire theFDN PIN for your SIM card from yourservice provider.1. From the application tray, touchSettings > Phone > Fixed DiallingNumbers > enable FDN.2. Enter the FDN PIN and touch oK.3. Touch Manage FDN List > >Add contact.4. Enter a name and phone numberand touch Save.5. Enter the FDN PIN to add thecontact to the FDN phone numberlist.NoTe: You must enter the FDN PINto disable FDN.Audio SettingsFrom the application tray, touchSettings > Audio.• Ringer Mode—sets the ringermode (page 10).• Ringtone—sets the ringtone for aphone call.• Notifications—sets the ringtone fornotifications, such as text messages.• Touchtones—plays a tone whenyou touch the screen.• Ringer, Navigation or Media—allows you to adjust the volumelevels of each output.