Is the amount of data being transferred per trip significant? I mean, how much of a difference would it make for "smaller players" (Lyft?) to go this route? And if the savings are significant, does that mean that the cost to drivers is non-significant? If Uber has enough money that the savings on datacenters to them isn't huge, I'd hope they would eat the cost if the phone-as-a-datacenter route ends up being a burden to their individual drivers.