After iPad 3G sold, iFixit has "groups" into the computer and found this board, including five iPad 3G antennas to ensure Internet access.

Compared with the original iPad (based on Wi-Fi), 3G iPad more network access the Internet through AT & T's data. iFixit says that "differences can be seen immediately on top of the window iPad 3G RF antenna black plastic for better reception." iPad 3G antennas all have 5: 2 for 3G reception, 2 Wi-Fi/Bluetooth connection, one for GPS. In fact, iFixit says Apple is using the full LCD screen as a frame antenna.

iFixit also said that Apple uses the same base band processor (baseband) for two models of Infineon iPad, but iPad 3G AGPS Single Chip BCM4750UBG Broadcom. iFixit also described in detail to what type of screws used to hold together iPad.
iPad 3G priced at 629 dollars to 829 USD. Compared with the model iPad Wi-Fi, 3G iPad corresponding models are more expensive than the cost of 130 USD. AT & T will offer two packages 3G data for the iPad: package 15 USD per month which allows transfer to / from iPad 250MB of data and package 30 USD per month, unlimited access.