To dial by voice, touch and say a name or number. (Or, skip the Phone app entirely and use a voice command to call someone.)
To call someone by name, start typing the name in the search box. You'll see a list of possible matches. Just touch one to call.
To dial a number, touch , enter a number and touch . If you enter a wrong number, touch .
To scroll through contacts and touch a number to call, touch . (If the dialer is open, swipe down to see the tab.)
To call contacts that you've starred, touch the tab.
To return a call, touch , then touch next to the number.
During a call, you can use the keypad to enter numbers or codes, use speakerphone or a paired Bluetooth device, and add other people to the call. Learn more.
To hang up, touch .
Tips
To call frequent numbers with one touch from your home screen, add a Direct dial widget.