You can set and record a personal prefix, via your account on the web portal: https://secure.telemessage.com/memberLogin.html.
You can find it under Options->Preferences (left side menu). And click on Preferences->Voice Tab->Update Voice Prefix.
Just login with your username and password (the login credentials were sent to you as an SMS and should appear in the App).
This voice prefix will be played to users at the beginning of each message (and will replace the “you have a text message from XXXXX”).
We can also create a custom prefix and voice call for you, this is a paid service we provide customers that have recurring volume and commit to a monthly minimum.