Open the Contacts application.
Tap the contact with whom you want to communicate.
In the contact’s details screen, tap the way to start communicating with the contact.
The Dial icon
places a call to the number.
The Message icon
starts a message.
The Email icon
starts an email.
The Chat icon
starts a chat.
These same icons are also displayed when you tap an entry in the Favorites tab and the Recent tab.