I too am in Houston. Have received 2 calls on my cell today (6-27-12) w/ no voicemail left. Fortunately, after reading these posts and after receiving the first spam call, I added it to my "Spam" contacts on my iPhone, assigned it a silent ring tone, and got GREAT SATISFACTION when the second call came in because I never even heard it ring!! This is about the only way to block spam calls to your iPhone folks. Still, it works like a charm!! Gotta stop these annoying calls some way....
Ha ha....these idiots just called my cell # for the third time today. SO GRATIFYING to not even hear my cell ring & just see the words "SPAM CALL" on my caller ID. Really satisfying to know the calls are going straight to my Spam Contacts. SO GREAT!!