How do I know the difference
How do I know the difference between the iPad 3G and iPad 4G from outside the casing,
Welcome to the Apple Support Communities
The main difference between a 3rd and a 4th generation iPad is its connector. If you look at the bottom of the iPad, you will see the connector. In the 4th generation iPad, there's a Lightning connector, and in a 3rd generation iPad, a 30-pin Dock connector (as the one that you can find in old iPhones and iPods)
