Can't verify my Sprint Palm Centro - Sprint sucks!

I'm trying to set up Twitter with my Sprint Palm Centro. I keep texting 40404, and I don't get a reply. I also tried sending a short code to Google - and still no reply. I called Sprint to see if they could check to see if my short codes were blocked, and they said all of their phones don't support third-party applications such as Twitter. Then how is it that other Sprint customers can tweet from their mobiles and I can't? Please help.
 
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