hmm I don't know but I can venture an idea; after inserting the sim card did you change the phone's mode to gsm only? Since the tp2 can only run one network at a time and sprint isn't configured to read gsm cards in the US then I would think the only way to get full access to the sim is to make it to where the phone has to use it.
of course, I could be way off
, if you figure it out some other way let me know haha