When the cost of phone like chips will be cheap enough for every detector or button it will dramatically change our life. Imagine volume sensor with phone like connections in a garbage bin = collectors tracks only when they needed.
Even though it will happen sooner than we think, meanwhile we can use timing principal to make the tech cheaper. We produce thousands of phone sim cards with the same number, however, each phone can connect the base tower only in specific time frame.
Alternatively some general radio waves could be used, like this
http://www.gizmag.com/gotenna-radio-network/33039/
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