As an aside, I know for a fact that 4 (ridesharing) is possible without a smart phone... if you speak Yiddish. In Williamsburg, Brooklyn I saw an ad for an integration between flip phones and Lyft geared towards the Chasidic population many of whom believe that it is forbidden to own a smartphone but OK to have a flip phone. I haven't dug into the internal reasoning from a Jewish legal perspective, but from the outside, it's a fascinating place to draw the line.

I also find it fascinating from an engineering perspective. I wonder what other apps they've managed to integrate into the flip phone?