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> If you made your house/apartment a Faraday cage

Might put a crimp on your cell phone reception ...

Is there a way to build your Faraday cage to block out wifi wavelengths but not cell phone ones? How far apart are they?

You could likely block anything over 2.3 GHz and get away with it: https://en.wikipedia.org/wiki/Cellular_frequencies_in_the_US

unless you have Sprint ;-)

This is usually done with a femtocell.