I love getting e-mails like this:
I just wanted to thank you from the depth of my soul for your "Mac OS X, Windows Mobile, Bluetooth modem" article. I have been trying to get my T-Mobile iPAQ h6315 phone to work with my powerbook for the better part of 9 hours, including 2 hours and 9 transfers with t-mobile's technical support. I had originally tried the method you described with various modem scripts, all without avail,..until I saw in your post "T-Mobile users aren't required to put in a specific username or password, but apparently it breaks if you don't put something in both fields." I put in some random garbage and tada! it now works perfectly. My sincerest gratitude.