I just did this to one. Not the best write-up as I'm busy but I figure I'd get it out there.
1) Use the voice dialer by holding send, say "market". Download and install Astro File Manager and Titanium Backup
2) Put Universal Androot apk on sd card.
3) Open Astro and install androot and get root.
4) Open Titanium Backup...update busy box.
5) Scroll down to sprint id and uninstall it.
DONE.
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