"The principle is so trivial, that you must know it works. Either you're lying on purpose, or you're not really an RF engineer. Which is it?"
The principle is not trivial at all. It's impossible, unless you encase a building in mu-metal.
As to me being an RF engineer, would you even know the difference?
The principle is the inverse square law, moron. If the jamming signal's power is insufficient to overcome the cellular signal, the phone will work. The jamming power can be reduced as low as desired, producing a bubble of any desired radius. That's why, for example, the range of a wireless device can be calculated.
To proceed empirically, it suffices to stand someone with a cellphone inside the wall, and someone else with a cellphone outside the wall. The transmitting power and antenna position can then be adjusted until one phone works and the other doesn't. Of course there's an added buffer zone, between the building and the sidewalk.
You are making the disingenuous statement that the field strength doesn't fall to zero, unless the walls are shielded. That's completely irrelevant, and if you're an actual engineer you know that. It doesn't speak well of your honesty, though.
As to me being an RF engineer, would you even know the difference?
My PhD is in mathematics, not engineering, but I've seen an engineer or two.
I am sitting in a cell phone proof building as we speak. No signals can be received inside, at all. AM doesn't work either, I do however receive FM. Top of the line government structure?.......No. U.S. Steel metal barn in the shape of a quonset hut, 42'X 36', 17' high, I store my tractor and tools and have my shop in here, I also have a landline for the Internet...NO cell phone calls at all.....am I breaking the law?