Making a call on iPhone is as simple as tapping a name or number in your contacts list or tapping someone in your favorites list. Or tap the name of a recent caller to return the call. Your contacts are automatically synced with the address book on your computer each time you connect iPhone.
The cell signal indicator, 
, at the top of the screen shows whether you're in range of the cell network and can make and receive calls. The more bars, the stronger the signal.
Making a Call
Making a call is easy — simply tap an entry in your list of contacts, favorites, or recent calls on iPhone. Or you can make a call the "old-fashioned" way, by entering a number on the keypad.
Call someone in your contacts list
Tap Contacts and choose a contact, then tap the phone number you want to call.
Call someone in your favorites list
Tap Favorites and choose a contact.
To add a recent caller's number to your favorites list, tap Recents and tap
next to a caller, then tap "Add to Favorites."Call someone you've recently called or who has recently called you
Tap Recents and choose a person or number. Calls you've missed are shown in red. Tap Missed to see only missed calls.
You can also tap Keypad and then tap Call, to bring up the number of the last person you called.
Dial a call
Tap Keypad and enter the number, then tap Call. Tap 
if you make a mistake.
Answering a Call
When someone calls you, iPhone rings and displays the caller's information.
When you receive a call, do one of the following:
- Tap Answer. Or, if iPhone is locked, drag the slider.
- If you're listening through the stereo headset, you can click the mic button to answer.
