The site also says "Prices were collected from the operator with the largest marketshare in the country" but follows it with "Because these numbers are based on the least expensive plan, they are best case scenarios." which doesn't logically follow. But going with that, the largest carrier in the US is apparently AT&T, and just the first plan on their site offers a 4GB plan at $50, or ≈$12.50 / GiB, which is an order of magnitude lower than the figure on the site?
