From what I can find, as with the chips used in Android phones, Apple's A# (or at least A7 and A8) Chips have integrated FM Receivers. Of course whether they are *available* is another question which I don't have the answer to.
Music on Smartphones still kind of defies me. It seems like you need to use some sort of music streaming service in order to get a reasonable experience. I have a Nexus 6. I was able to, after some effort, find the *legitimate* version of VLC on the Android Play store, And I copied over a section of my Music Folder, but VLC seemed arbitrary in what it saw. It was missing entire albums, missing specific songs, or it was seeing some of them and then not letting them play. I couldn't find any pattern- of the things it found, there was FLAC, VBR MP3, normal MP3, OGG; and of the things it didn't find was the same file types and properties.
Paired with the fact that the battery lasts maybe 3 hours when playing music, that 32GB of space has to be shared with everything else on the phone, and that even if I was able to get all the music to appear, I'd have to laboriously build playlists one music track at a time by digging through various hamburger menus, I ended up wiping most of the music tracks altogether and just use my "Walkman" MP3 Player for portable music. it only works properly with MP3, which is why I wrote a bulk transcoder that converts files to MP3 from various source audio formats.
And if I was inclined to listen to the radio- the MP3 Player has that already anyway. Doesn't need an "App" installed either.
The Smartphone? "$400 glorified alarm clock" is the most accurate description of it's usual task so far for the last 4 years.