I checked your link because the claim seemed improbable to me. Here is what I found: - 77% US adults currently own a desktop/laptop computer (interestingly, t

I checked your link because the claim seemed improbable to me. Here is what I found: - 77% US adults currently own a desktop/laptop computer (interestingly, this seems to hold mostly steady since 2008) - 85% US adults own smartphones There is no "only own a smartphone category" in the data. There is a "relies on their smartphone for internet access, with no broadband internet". This one is just 15% of adults, though slightly higher in the 18-29 age group. I can't see anything in that link that would support the majority of people using only a mobile device.