If you wish to uninstall the App using iOS6 then you need to uninstall the APN Profile and reset your network settings.
Apple have either changed the functionality of the APN removal process or introduced a bug where the APN Profile is not cleanly removed.

Process to completely remove the APN for iOS6:

Go to Settings | General | Profiles and remove the Snappli APN Profile.
Then go to Settings | General | Reset | Reset Network Settings 
This will unfortunately lose your previous networks and wifi settings.

We will update this document when we get a response from Apple.