It might. Just google how to build a faraday cage.
Originally Posted by onawbtngr546
That's not necessarily reliable. The capacitive coupling between the phone inside and the faraday cage surrounding it can make the cage act like an antenna. Ideally, the faraday cage should be tied to an equipotential, (like ground). Furthermore, imperfections (like seams) in the surface of the faraday cage can allow leakage when the wavelength is comparable to the size of the imperfections. A blatant example is that your phone works inside your car even though your car is mostly metal. The phone works because the windows are much larger than the wavelength of the phone signal. On the other side of that is the reason that the screen on a microwave oven door acts as a faraday shield is only because the wavelength of the microwaves are longer than the size of the holes in the screen. Unless you have the means to test it to make sure it's doing what you think, it's better (and easier) to just pull the battery.