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Another unique feature of the iPad 3G not found on the standard model is an internal assisted-GPS chip, which allows for a more accurate gauge of your location.
The iPad 3G includes a barely noticeable micro SIM card tray midway up the left side. Using the included poker tool, you can eject the tray and access the SIM.
You could be barbaric and use a paper clip to eject the iPad 3G's micro SIM card tray, but the included poker tool is far more elegant.