What I don't understand is why anybody would use an iPhone as a radio. Battery life is limited, and if you are in a disaster area (the reason people say the iPhone needs a radio) your won't have any way to recharge it.
On the other hand, a simple internet search for battery powered radios turned up about 100 for under $80. The one I liked the best (to satisfy the iPhone/FM radio folks) was $70 and could be powered by built-in solar panels, rechargeable battery or hand crank. It also included a built-in signaling flashlight and USB ports.
https://www.firesupplydepot.com/kai...shopping&kw=kaito-voyager-solar-weather-radio
If anyone was truly interested in a disaster radio this option makes far more sense than requiring an FM radio in the iPhone (or any handset for that matter).