Dtmf Tones; Voice Privacy Mode - Samsung Galaxy J1 User Manual

DTMF Tones

You can modify the dial tones for dual-tone multi-frequency (DTMF)
signaling. DTMF tones are used as input by some automated
phone systems for making selections.
1. From a Home screen, tap
DTMF tones.
2. Tap either Normal or Long.

Voice Privacy Mode

If supported by your carrier, you can activate Enhanced privacy
mode to encrypt voice signals.
1. From a Home screen, tap
2. Tap Voice privacy to either enable or disable this feature.
Settings
Apps > Settings > Call >
Apps > Settings > Call.
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Call Settings