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In the US, users can subscribe to a 3G data plan directly on the iPad 3G. Credit card and cardholder information is relayed directly to AT&T, cutting out Apple as a middleman. We're yet to see the UK's options.
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.