A test lab is a room that is completely isolated from the outside (and in a way that the RF doesn't leak outside of the premises) where you can do these kind of experiments.
Considering the amount of teams working on the Google Dialer, and the fact that they might be distributed across multiple cities / countries - this sounds very expensive.
Considering the amount of teams working on the Google Dialer, and the fact that they might be distributed across multiple cities / countries - this sounds very expensive.