Information is lighter and travels better than people, cars, voting machines, ballot boxes, ballots, judges, ledgers, and the card-counters and computers that now count most of our votes. The phone system that carries information is free for local calls.
Every years millions of trees become ballots to be counted and tossed or recycled. Millions of gallons of gas are burnt to get to the polls.
Phone voting is as efficient as the Internet and World Wide Web, but lets you vote from any phone in the world- in case you don't have your laptop, modem and local access.