Apple iPhone 4 support.

To send a text message:

1. Tap Messages





2. Tap Compose





3.  Enter a phone number or tap Add Recipient to choose from your contacts





4. Once you've added all the contacts you want, type your message in the box shown below and tap Send

Your message will now have been sent.

For more help go to: http://www.apple.com/uk/support/iphone/phone/