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.

How to Add Someone's Phone Number to Your Contacts on Gmail. 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 ...

Tired of saving numbers just to send one WhatsApp message? Here’s how you can chat on WhatsApp without saving a number, using simple tricks and hacks.