I think I shouldn't have said all tabs with 3g - all 7" and 7.7" tabs is what I meant. Fairly sure the 8.9" and 10" ones do not.

The sound on the 7.7" is excellent, just as good as a "normal phone". I have just been photographed by a colleague whilst talking on it so they could laugh at the me, but the conversation was fine.

When in "phone mode" the speaker is at the middle top (opposite end to the samsung logo) and the mic is near the centre in the bottom edge of the device. There are more "loudspeakers" for handsfree on the bottom edge.