Detect smart phones in 30m circle


hello everybody!

is possible detect cell phones(maybe it's type iphone, android etc) arduino + arduino compatible shield. mean count number of cell phones in 15 - 40 meter radius circle on street?
or there home made( cheap  :)  ) solution achieve this?

thank answers.

the way detect powered-up cellphones listen in on cellular networks.  i don't think  either cheap or easy.  to information phone need listen in on , decode cellular protocols.  that less cheap , less easy.


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