Buy phones and place phones, and most of all, ignore all the calls. Routers and A.A.M's boost surrounding phones. they do not receive any calls. This goes for time elapsers too, except they boost all phones, not just surrounding phones. CPS stands for calls (ignored) per second on average.
Dedicated to @gabedabot who has been ignoring my calls for 2 months. He should be pretty good at this game. ALL MUSIC WAS CREATED BY ME V1.0 - release