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 ...

WhatsApp is one of the most popular messaging apps on the planet. Here's how to add your iOS and Android contacts to your WhatsApp list to easily stay in touch.

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