Samsung Galaxy S4 User Manual page 82

Note: When you activate the Auto redial option in the
Call settings
automatically redials up to 10 times when the person does not
answer the call or is already on the phone, provided your call is
not sent to the persons's voicemail.
Quick Dialing a Number from the Contacts List
1. From the Home screen, tap
2. Locate a contact from the list.
3. In a single motion, touch and drag your finger over the number
by going to the right. This action places a call to the recipient.
Running a Call in the Background
If you exit the current call screen and return to the Home screen, you
are visually notified that you are still on an active call by the green
phone icon within the Status bar.
This is the best way to stay on your current call and do something
else (multi-task) such as access the Contacts list, view a recent
email, locate a picture, etc..
74
Additional settings menu, the device
(Contacts).
In Call Notification