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I just briefly looked at the code. This code was written a while ago (approx. 4 yrs) and it's using $HTTP_COOKIE_VARS which has been deprecated. It should be using $_COOKIE instead. Depending on your version of PHP, your register_globals settings, etc. this could be causing part of the problem.
The other thing you need to make sure is that you update the ./cache/config.php with your SMS information.
You can also update ./cache/service.php with the current name/email variables so that it "fixes" things like the current AT&T settings, remove Cingular, etc...
