...it's always a good idea to ask over in the Sprint sub-forum @ hofo. I've received some really good help there on behalf of a friend who was having issues with her handset/service. My gut feeling is your options are limited since they are generally a discount carrier. There typically is a missing plan at a number of minutes/price point where it would benefit you & I, but the carrier calculates better returns below and above where we most need it. Here's the URL-

http://howardforums.com/forumdisplay.php?f=53