Based on my understanding, wireless signals are lights. Why can I use my gadgets inside a room?
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It depends on how things interact
solid things can interact with solid things
some solid things also interact with non-solid things.
Glass and concrete are both solid enough to interact with light, think of it like glass lets most of the light through because it interacts with it a little less than concrete does.
Wireless signal is a non-solid thing, so it interacts with some solid things more than others. Air is mostly space and not very solid (dense) this means that non-solid stuff doesn’t interact with it very much at all, now if you take something like lead which is very solid, it interacts with more non-solid stuff so it won’t get through.
Most of the stuff your house may be made out of will be quite solid compared to light, but not so solid compared to stuff like radiowaves, so they can go through much easier, like it’s a window but only to radiowaves.
So imagine that different solids and liquids are like windows to different things
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