Excuse my ignorance of mobile phone technology, but presumably this requires you to run google maps (or similar) whilst riding/driving, and does this use up your data allowance?
Logically, it will depend on the camera warning software you are using. If you have downloaded a physical map of the camera's points that allows a position to be plotted via a bog standards GPS signal picked up by your phone and that position is then compared against the map (on a Garmin device, that's exactly what they do) it would be free. You'd pay for the map of camera positions and nothing more.
If though it requires the map and the position to be both streamed in as data, it would be something quite different. Somehow I doubt it.
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