Just as you can start an instant message conversation with other people, they can start one with you.
To open an instant messag e
When you receive an alert for an incoming instant message, the alert displays the sender’s name and the first few words of the message. Do one of the following:
Tap Show to open a conversation window and view the entire message.
Tap Dismiss to close the alert.
Do nothing until the alert disappears.
If you do not immediately view an incoming message, you can tap Current Conversations in your Contacts list to view the message later.
See Als o