You can see the messages you have sent to and received from a particular contact from a single view, and continue the conversation from that view.
Select Menu > Messaging.
Select Conversations and a contact. All messages sent to and received from that contact are displayed.
Reply to a message in a conversation
Open the conversation.
Select the text input field at the bottom of the display, and write a message.
To add attachments or more recipients, select Options > Add.
To send the message, select .
When you send a new message, it is added to the current conversation. If no conversation exists, a new conversation is started.
When you open a received message from the home screen, by default, the message opens in the Conversations view. If you want messages to open in the Inbox view, select Options > Message view > Inbox.