In Call Options - Samsung Galaxy S4 User Manual

Making a Call Using Speed Dial
You can assign a short cut number to a phone number in the
Contacts List for speed dialing.
1. From the Home screen, tap
2. Touch and hold a previously created speed dial location
(numbers 2-100, or 1 if you are dialing voice mail) until the
number begins to dial.
3. If you are not certain of the speed dial location, tap
number to view the assigned phone number.

In Call Options

Your device provides a number of features that are available for use
during a call.
Personalized
call sound
Dialer
Noise
Reduction
Adds a
new call
Activates or
Deactivates
speakerphone
Speed dial setting and tap a speed dial
Mutes or Unmutes
the call
Call Functions and Contacts List
.
Call duration
Places a
call on hold
Extra volume
Ends the
call
Activates or
Deactivates
Bluetooth
Headset
78