I did this, it works great, BUT... I had to modifiy the http link from what was listed in the original post. The original post has "http://mms.sprintpcs.com/servlets/mms", but I had to use "http://mms.sprintpcs.com/servlet/mms", i.e., "servlet" instead of "servlets".
I've seen other addresses listed around the internet, but this is the one that worked for me. Maybe the link is a moving target?