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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.
As the name suggests, the micro SIM card used on the iPad 3G (shown right) is considerably smaller than a traditional SIM card (shown left).