Screw it. I say fiberoptics. Because that way you can simple have the fiberoptic switches all steam-powered.
As for the cell phone analogues, that's easy too. Chem-pack generates heat to make steam to power the phone - probably lasts longer than batteries since
there's so much potential power in steam. You can even use a set of cooling channels in the phone to help cool the circuitry and preheat the water before
it hits the micro-boiler. Otherwise it's like a regular cellphone.
As for the cell phone analogues, that's easy too. Chem-pack generates heat to make steam to power the phone - probably lasts longer than batteries since
there's so much potential power in steam. You can even use a set of cooling channels in the phone to help cool the circuitry and preheat the water before
it hits the micro-boiler. Otherwise it's like a regular cellphone.