I am a driver but I take Uber sometimes. I ran into a driver the other day who told me he had two phones to double the chances of getting pings (i.e. pickup requests). He said he had his spouse open an account so he can be logged in and carry two phones. He said this worked like a charm.
In amazement, I asked some questions, and he said he has never been caught. They were both under the same car insurance and registration, so the customers can feel at ease that the car is the one they called.
Now, besides the shadiness of this practice, do you think this will really work?