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FCC mandates all mobile phones in the US to be compatible with hearing aids
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
A total aside, but I was always annoyed early smart phones had am/fm receivers in them (free on the chip) and relatively few phones ever let them be accessed. I think most of those also could do TV signal, if I'm not mistaken? But that may have been a subset.
Sure, that probably played hell on the battery, but it would've been neat to have the option to DVR TV over the air on my phone back then and cast it, in the early days of Chromecast.