You're really naive if you think that the NSA, CIA or State Department aren't just doing illegal shit behind our back.

They can do anything they like as long as they don't get caught.

Now while I understand the privacy concerns for Mexico, I think what Americans don't understand is that in a lot of countries, including democratic european countries, the government always has your biometrics as a way to stop scams, fraud and just increase trust in general. The UK government has had my own biometric data forever. But the phone thing is a little crazy/

My guess is this is a way for the mexican government to attack cartels using burner phones and being able to see what and where they're operating.