In the world of MVNO (Mobile Virtual Network Operators) providers, sometimes you get get into unique situations. This particular iPad 2 Air presented me with a challenge. Instead of having options to set the APN settings, the settings are blocked by carrier specific options. These options should be under Settings > Cellular > Cellular Data but they were no where to be found. It took me a few days to find a “work around”.
https://www.unlockit.co.nz/fw/ is a website that instantly creates a iPhone profile to apply to the device. It creates the file based on your provider (you pick it from the list) and provides a file to apply to the device as a MDM profile. Once the profile is applied, the device will have correct APN settings.
It would be best to get the carrier’s help to either provide the file or help you get by the issue. This website, while has been trustworthy in the past, it isn’t a sanctioned by the carriers. Use at your own risk, most likely until you can get help from your MVNO.