There is a massive problem with the app. I was waiting for the driver and when the driver arrived I wanted to move the map a little to see their location and then BAM. With no messages saying "are you sure you want to change your driver?" the app decided that that's not my driver anymore and called someone else instead. I just saw the poor guy do a 180 and leave after getting all the way there and now I had to wait till someone else arrived. At least don't change driver with a simple swipe.