> I started to carry my phone in airplane mode, in an electromagnetically shielded pouch (most of which only work marginally), when in transit from place to pla

> I started to carry my phone in airplane mode, in an electromagnetically shielded pouch (most of which only work marginally), when in transit from place to place. That looks extremely suspicious. If they don't have a match, looking for "who turned their phone off somewhere in the vicinity and turned it back on 30 minutes later somewhere else" makes sense. If you don't want to get tracked, leave your phone at home, and carry a switched-off burner for emergencies.