If you look carefully enough, you'll find material to read out there which claims almost anything. To determine the risk of 'increased radiation' from a dropped or damaged iPhone, one would first have to determine what types and levels of radiation the device created in the first place, and thus whether the casing or normal functioning of the device would actually put the user at risk in normal circumstances, let alone if the device was damaged in some way.
It is kinda like a science experiment. :-)
My answer would be that phones give off the same amount of radiation as they are when they are not damaged versus when they are damaged. It’s more of an urban legend that a damaged iPhone emits more radiation then an iPhone in perfect shape.
Since there remains debate about whether cellphones actually pose a genuine health risk at all, all one could reasonably say is that you are not likely to be at any additional risk unless you also note a degraded performance from the iPhone.
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