The major feature missing from the U.S. versions of the Samsung Galaxy Tab is the ability to make phone calls. (OK, some of us might consider that a feature.)
But the T-Mobile version of the 7-inch Android Tablet apparently has already been hacked to enable the voice end of things. That's what you see in the image to the right.
You're going to have to do some fairly major surgery -- and this isn't going to work on the Sprint or Verizon versions -- and then enable some of the wireless settings manually. And even after all that, you're not going to want to hold this beast up to your head.