There are two main flavors of the iPad series of devices: the WiFi version and the 3G version.

The easiest way to identify your type is by the model number or if the top of your iPad has the black shield covering the 3G antenna.

The model number will be written on the back case of the iPod and should be easy to identify.

iPad #s

Model # Make Specs
A1219 iPad Wi-Fi 9.7" 1.0GHz A4
A1337 iPad Wi-Fi + 3G 9.7" 1.0GHz A4
A1395 iPad 2 Wi-Fi 9.7" 1.0GHz A5
A1396 iPad 2 Wi-Fi/GSM 9.7" 1.0GHz A5
A1397 iPad 2 Wi-Fi/CDMA 9.7" 1.0GHz A5
A1403 iPad Wi-Fi/CDMA 3rd Gen 9.7" 1.0GHz A5X
A1416 iPad Wi-Fi 3rd Gen 9.7" 1.0GHz A5X
A1430 iPad Wi-Fi/GSM 3rd Gen 9.7" 1.0GHz A5X
A1432 iPad mini 7.9" 1.0GHz A5
A1454 iPad mini Wi-Fi/T-Mobile 7.9" 1.0GHz A5
A1455 iPad mini Wi-Fi/Sprint 7.9" 1.0GHz A5
A1458 iPad Wi-Fi 4th Gen 9.7" 1.4GHz A6X
A1459 iPad Wi-Fi/AT&T 4th Gen 9.7" 1.4GHz A6X
A1460 iPad Wi-Fi/Verizon 4th Gen 9.7" 1.4GHz A6X
A1474 iPad Air 9.7" 1.4GHz A7
A1475 iPad Air T-Mobile 9.7" 1.4GHz A7
A1489 iPad mini 2nd Gen Wi-Fi 7.9" 1.4GHz A7
A1490 iPad mini 2nd Gen Wi-Fi/Sprint 7.9" 1.4GHz A7
A1538 iPad mini 4 Wi-Fi 7.9" 1.4GHz A8
A1550 iPad mini 4 Wi-Fi + Cellular 7.9" 1.4GHz A8
A1566 iPad Air 2 Wi-Fi 9.7" 1.5GHz A8X
A1567 iPad Air 2 Wi-Fi + Cellular 9.7" 1.5GHz A8X
A1584 iPad Pro 12.9" 2.2GHz A9X
A1599 iPad mini 3 Wi-Fi 7.9" 1.4GHz A7
A1600 iPad mini 3 Wi-Fi + Cellular 7.9" 1.4GHz A7
A1652 iPad Pro Wi-Fi + Cellular 12.9" 2.2GHz A9X
A1673 iPad Pro 9.7" 2.2GHz A9X
A1674 iPad Pro Wi-Fi + Cellular 9.7" 2.2GHz A9X
A1822 iPad Wi-Fi 5th Gen 9.7" 1.8GHz A9
A1823 iPad Wi-Fi + Cellular 5th Gen 9.7" 1.8GHz A9