Field phones are eaasier than most think, and hiding wires isnt that hard in metro areas since there are poles full of wire everywhere you look, so even the wire is there if you can ring it out. Bells and smoke are not normal comms but alarm type broadcasts so at that point your position usually is known. What nobody has hit on yet, however is message security. Anyone know how to build an enigma machine? We cant depend on computers to encode a msg as they may be fried along with the radios we can't use... so cyphers will be necessary for security if it comes to that. Also an alternative place to route field phone wires are storm and sanitary sewers....
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