When someone "opts in" to one of your lists using your keyword, you may be wondering how you will know which number is which person?
Check out this page... the mobile keyword page...
1. Click the Keyword and Online Sign-up Tools page
2. After you have added a keyword, and filled out your auto response, scroll down to Data Capture... You can choose what data you want to capture (Name, birthday, school, favorite dog, etc)
To add more data fields, go to the "custom data fields" tab