The transmission power of your phone is adjusted based on how well your phone can talk to the cell tower. The harder you make it for the phone, the harder it tries. That translates into a sizzling hot phone in your pocket that has a battery life of one hour.
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Put it in flight mode while inside the case and take it out of flight mode as soon as it's off. That could automated.
My exact strategy for when I leave my stuff in the gym locker or when sleeping in sleeping bags that use metal heat reflector fabric.
An NFC tag inside your wallet might work? ;-)