You are having the same issue that many of us are having. I've been through many of the same steps you have. For the record its not a blackberry issue. Att is blocking the feature. Apparently they are taking the stance that they cm block certain features on devices not bought through them. Kinda defeats the BYOD concept in my mind, but I'm not as smart as them. I have an open case at Att and BlackBerry and will continue to question this practice as I see this as something they will grow.