iFixit has posted a full teardown of the iPad with Wi-Fi + 3G, finding several noticable differences between it and its Wi-Fi-only counterpart. The 3G model uses an Infineon PMB 8878 X-Gold baseband chip, the same as found in the iPhone 3GS, as well as a Broadcom A-GPS which is found on the communicaitons board, partially explaining why the Wi-Fi only model lacks GPS functionality.
Unsurprisingly, the 3G model houses new antenna assemblies for cellular and GPS connectivity; these join the antennas previously found in the iPad with Wi-Fi for Bluetooth and Wi-Fi communication. Judging by the teardown photographs, it appears that Apple used a microSIM instead of a full-sized SIM card in order to fit the component between the side of the unit and the large internal battery.
Overall, iFixit notes that while the inside of the iPad with Wi-Fi + 3G is “not nearly as barren” as the Wi-Fi-only model, it’s still “not jam-packed.”
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