I did once, on my last phone (a Samsung Note 2), because I wanted to record a specific event I knew about beforehand. I was actually impressed by how well that

I did once, on my last phone (a Samsung Note 2), because I wanted to record a specific event I knew about beforehand. I was actually impressed by how well that worked. From the whole "headphones as antenna" setup I'd always assumed FM radio to be rather dodgy...