Yes I'm afraid it does. T Mobile will show any number whether it is deleted or blocked. It will show the number, the time of the call, and the length of the call. You could however, use star 69. If you haven't used that before. Just tell the person to dial *69 and then type the number this will not show the number but it will just say anonymous. That is basically what you would have to do, but as far as if it shows up deleted numbers then yes it does. Hope this helps!