Zte Z837VL - Set Dtmf Tones; Other Options

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To assign a speed dial key:
1. Touch the Home key > > (in the top search field) >
Settings > Call settings > Speed dial.
2. Touch a speed dial key.
3. Enter a phone number or select one from the contact list.
4. Touch OK.
Set DTMF Tones
You can set the length of Dual-tone multi-frequency (DTMF)
signal tones.
1. Touch the Home key > > (in the top search field) >
Settings > Call settings > DTMF tones.
2. Touch Normal or Long.
Forward Incoming Calls
Call forwarding feature allows you to forward your incoming calls
to another phone number.
1. Touch the Home key > > (in the top search field) >
Settings > Call settings > Call forwarding.
2. Touch an available option (Always forward, Forward when
busy, Forward when unanswered, Cancel All Forwarding)
to configure.
Other Options
Check the Home key > > (in the top search field) >