[sgt]

Just a few meters, as per the article. I'm guessing if you can't hear it on the iPhone's speaker, it won't be audible on AM radio either.

[m0xte]

Correct. Although it’s possible on older handsets with 3.5 jack that the audio amplifier in the handset itself is possible to receive. I’m not sure about lightning.

But I very much doubt at the stated range. The EMC guys would be all over that.