Just today my friend was telling me a story of the end of a night out in downtown LA, ready to go home to the west side when he realized that he was out of high speed data (he's on a legacy Verizon plan) and he might not have sufficient data speed to order an Uber. Apparently Uber worked just fine (probably a network "management" deal), but he was quite worried he wouldn't be able to get home if he couldn't order an Uber.

I did point out that it is in fact possible to order a cab using a telephone call.