Fortunately for us customers, it seems Uber catalyzed a transition among most other taxi companies as well to improve this. A bunch of local taxi companies here have apps that have the same features as Uber, where you can pay in the app and see where the cab is on its way to you etc. There are "OEM" taxi callcenter cloud services that small taxi companies can rent to get the uber experience for their fleet without any IT knowledge, each car gets an iPad with an ODB connection and you're ready to go.