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Clarified the title a bit, and added one tag
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Cell Phone Filter / Interference?

How do cell phone filters filter out all the extraneous EM waves and noise (especially noise) when you get a call? 

I would expect a phone to have a bandpass filter to get rid of most noise but even then there is noise at still in the resulting signal.

Cell Phone Filter

How do cell phone filters filter out all the extraneous EM waves and noise (especially noise) when you get a call? I would expect a phone to have a bandpass filter to get rid of most noise but even then there is noise at still in the resulting signal.

Cell Phone Filter / Interference?

How do cell phone filters filter out all the extraneous EM waves and noise (especially noise) when you get a call? 

I would expect a phone to have a bandpass filter to get rid of most noise but even then there is noise at still in the resulting signal.

Source Link

Cell Phone Filter

How do cell phone filters filter out all the extraneous EM waves and noise (especially noise) when you get a call? I would expect a phone to have a bandpass filter to get rid of most noise but even then there is noise at still in the resulting signal.