To send a text message

On the Messaging screen, tap New message .
Enter a mobile phone number in the To field.

As you enter the mobile phone number, matching contacts appear. You can tap a suggested recipient or continue entering the phone number.
Tap the text field to start entering your message.
1. Tap here to enter numbers from your call logs, contacts, groups, or favorites.
2. The character counter displays the number of characters entered and amount remaining.
3. Tap here to attach the files.
A counter is displayed in the top right corner of the text field to tell you how many characters are left and the number of pages.

If you tap the Back Key while composing a message, it’s saved as a draft in your Messaging application. Tap the message to resume composing it.
Tap Send to send the message.

Your message is displayed and responses appear in the same window, creating a message thread with that contact.