TTY does not work from mobile phone to mobile phone.

1Open the main menu and touch 7Settings > Calling >

Advanced Call Settings.

2Touch TTY Mode, then select a TTY setting.

voice privacy

You can encrypt outgoing voice calls and use secure channels when available.

1Open the main menu and touch 7Settings > Calling >

Advanced Call Settings.

2At Voice Privacy, slide the switch to On.

get started

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Nikon QA4 manual Voice privacy, Advanced Call Settings