Samsung Galaxy J1 - Dtmf Tones; Voice Privacy Mode

157
Call SettingsSettings
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
Apps > Settings >
Call > 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
Apps > Settings >
Call.
2. Tap Voice privacy to either enable or disable this
feature.