If the adversary controls the phone network and the baseband processor - not much. If only a small percentage of the population buys encro phones, it might eve

If the adversary controls the phone network and the baseband processor - not much. If only a small percentage of the population buys encro phones, it might even be worthwhile for the authorities to log and plot all their movements and interactions, all the time. Even without breaking encryption, the traffic analysis alone would give valuable insights.