When you send or receive mail to or from someone in Gmail, a record of that person's name and email address is made in Gmail's contacts list so that you can quickly refer to people you've ...

You can add contacts to your iPhone in three different ways to store phone numbers, email addresses, mailing addresses, birthdays, and more.

Add contacts to your iPod Touch within the Contacts app. After you launch the app, tap the "+" symbol and enter the person's first and last name, phone number, email address and any other ...

You most likely have duplicate contacts with multiple phone numbers in your contacts list that are very unorganized, but iOS 7 makes it easy to remedy this.