The Recents List
Like any self-respecting cellphone, the iPhone maintains a list of everybody you've called or who's called you recently. The idea, of course, is to provide you with a quick way to call someone you've been talking to lately.
To see the list, tap Recents at the bottom of the Phone application. You see a list of the last 75 calls that you've received or placed from your iPhone, along with each person's name or number (depending on whether that name is in Contacts or not), which phone number it is (mobile, home, work, or whatever), city of the caller's home area code, and the date of the call.

Here's what you need to know about the Recents list:
Calls that you missed (or sent to voicemail) appear in red type. If you tap Missed at the top of the screen, you see only your missed calls. The color-coding and separate listings are designed to make it easy for you to return calls that you missed, or to try again to reach someone who didn't answer when you called.
A tiny phone-handset icon lets you know which calls you made (to differentiate them from calls you answered).
To call someone back—regardless of whether you answered or dialed the call—tap that name or number in the list.
Tap the
button next to any call to open the Call Details screen. At the top of the screen, you can see ...
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