Patent Office might be better than FCC. I was thinking FCC would be stricter with getting approval per model whereas a patent could be blanketed more across a range of models because FCC would require testing of each model, whereas the patent might be more flexible to span across models.
Well he has 2 places to try for that information Patent Office and FCC
Other issue is that during research you get statistics from a manufacturer today, and the information may be different tomorrow so there is no perfect count that i can think of. As for phones are being made daily and lots of them.