O2 allows customers to send up to 10 free text messages--each containing a maximum of 444 characters--to other UK mobile phone numbers each month. Access the free text messages feature by signing in on the My O2 account page. Enter the UK mobile phone number of the recipient and your message. The My O2 account page displays how many free messages you have remaining for the month.
Go to the "My O2 Account" Web page.
Click on "Sign in" at the top of the page.
Enter your O2 username and password in the empty fields and click "Sign in."
Click "Free texts."
Type the phone number of the recipient in the "To" field.
Type your message in the "Message" field. You can use up to 444 characters in your message.
Click the "Use free text" option.
Click "Send" to send your free text message.