There's a dead zone at the intersection of North Salem Rd and Hilltop Rd at the border of North Salem NY and Lewisboro NY.
41.306797, -73.614339
41.306393, -73.611307
Signal drops to zero bars (and SOS) across multiple Verizon iPhones both outdoors and indoors in the surrounding area.
Moving to this area and would like to keep Verizon service, but apparently AT&T and T-Mobile are better in this particular location.