To open Messaging
Tap the Home Key
, then tap the Messaging Key 
in the Quick Keys bar.The Messaging screen will open, where you can create a new message or open an ongoing message thread.
Tap here to create a new message.
Tap New message
to start a new text or multimedia message.Tap an existing message thread to open it.
Tap
to make a call in the message screen.TIPQUICK REPLY
When a New Message notification pops up, choose to reply quickly without accessing the Messaging application by tapping the Text field in the notification to respond with a text message, or tap Call
to dial the contact or Delete 
to delete the message.