The iPhone phone application allows you to make calls over your mobile network. In addition to containing the Contacts application, and being able to make a call from a Conact listing, you can also press the keypad button at the bottom of the screen to bring up a traditional phone keypad.
One nice thing about the iPhone phone keypad is you have a backspace button, so you don’t need to start all over again if you make a mistake in entering a number.
You can also enter a phone number in the keypad, and then press the + button at the lower left to simply create a contact for the number you’ve entered.
Once you place a call, you will get a set of buttons: Mute, Keypad, Speaker, Add Call, Hold and Contacts. The Hold, Mute and Speaker buttons do as you would expect. The Keypad allows you to enter in touch-tones if you are calling an automated system. Add Call allows you to call someone else and create a conference call. The Contacts button lets you view and edit contacts while talking.
The Recents button at the bottom of the Phone application allows you to see and redial phone numbers you have recently called or have called you.