I remember as a young man the empty barracks along the freeway between Pleasanton and Livermore CA that was used to house the Japanese during WW2.
First off I can seriously see the requirement of a VERY portable solar charger for your phone, when disaster strikes they may give you a meal, a cot, and water but they don’t want you telling it to the rest of the world.
Speaking of charging a cellphone and power, a charger is drawing less power than a single marker or tailight on a car, we are talking in fractions of a watt.
I bet they are also considering activation of cell phone jammers.