In terms of on-paper efficiency, I agree. However, doesn't the wi-fi network solution require shoppers to have wi-fi enabled on their device in order for it to

In terms of on-paper efficiency, I agree. However, doesn't the wi-fi network solution require shoppers to have wi-fi enabled on their device in order for it to work? Most people I know with smartphones keep wi-fi off unless they need it, and asking shoppers to "pretty please turn on wi-fi while you're shopping" is a questionable proposition.