I was wondering if anybody can get this working for the Pre. I had it on an ATT phone for work and it worked flawlessly, the free version. You have setup the call forwarding and stuff and they give you directions. But they don't offer it for Sprint and a few other carriers yet.
Trap call unmasks blocked calls by you ignoring a blocked call and it forwards to some trap call number and then comes back to you and the caller doesn't know...
trapcall.com