Looks like you haven't watched enough spy movies
Joke on the side. Even if you do not know the technique at all, it should be clear to you that your cellphone is not receiving a signal from the air.
In short: It receives from the base station knows exactly where the location is. The mobile phone simultaneously receives and sends a signal.
At any one time it is "covered" by several signals, so that its location can be determined by exact calculations.
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