T-Mobile should stop claiming it has “Best Unlimited Network,” ad group says

T-Mobile USA should stop claiming that it has "America's Best Unlimited Network," the advertising industry's self-regulator said. AT&T challenged T-Mobile's ads to the National Advertising Division (NAD), which ruled that T-Mobile hasn't substantiated its claim that it has the best wireless network. T-Mobile defended itself by arguing that speed outweighs all other factors—apparently including overall coverage and reliability. But to reasonably claim that one has the best overall network for unlimited data, a carrier should prove that it also has the widest geographic coverage and best reliability, the NAD concluded. T-Mobile said it will appeal the NAD decision to the National Advertising Review Board (NARB). T-Mobile's best network claim has appeared in online, TV, and radio advertisements.