Write a Sprint PCS J2ME application that determines your phone number.

I think you can actually do this!

Point your phone's browser to this page:
http://ecare.sprintpcs.com/eCare/en/shtml/MOUII_Usage.jsp?index=0&min=null
You will see your "Minutes Used" summary. At the bottom of that page (on my phone anyway), is my phone number!

This means I should be able to write a J2ME MIDlet that retrieves that page and scrapes the data to determine the user's phone number. THAT is a very useful thing!

Anybody want to try it and report back?