You can always check by looking at the model numbers (although, having a camera is a pretty big clue that the iPad is either an iPad2 or an iPad3. Regardless, this is from a tech site that discusses the model numbers. You can look on the back of the iPad and see which model number you have:
[/QUOTE]In the short-term, the iPad 2 models can easily be identified and differentiated from the original models by the cameras, but as future iPad models have cameras as well (and the iPad 2 GSM and CDMA models are externally identical), it is useful to be able to reference the model numbers on the bottom rear of each device.
The original iPad (Wi-Fi) is model number A1219 and the original iPad (Wi-Fi/3G/A-GPS) is model number A1337, whereas the iPad 2 (Wi-Fi), iPad 2 (Wi-Fi/GSM/A-GPS), and iPad 2 (Wi-Fi/CDMA/A-GPS) have model numbers A1395, A1396, and A1397, respectively.[/QUOTE]
Hope that clarifies.
Marilyn