I started using Sidecar, and more recently Uber, because I couldn't get a cab ride. There were plenty of times I tried calling for a cab in SF's SOMA district,

I started using Sidecar, and more recently Uber, because I couldn't get a cab ride. There were plenty of times I tried calling for a cab in SF's SOMA district, only to be disappointed when either no one answered the phone and/or no one showed up. If you happen to live in an area where one can realistically have a chance of hailing a cab, and you call for a cab, it's probably more like ordering a pizza. Place the call, and it'll show up eventually.