Does the phone definitely have credit on it?
Is it on contract or PAYG?
Yes and there are no problems with it apart from the text messaging. It's on contract.
So you can make and receive ordinary telephone calls OK?
Who is your contract with?
Have you been able to confirm that texts are on your account to use?
Yes and I am able to receive texts.
Are you clicking the 'envelope' button when you send the text
Yes and it says that it is sending the message and then after about a minute it says that the text has failed.