What a confusing list, ATT is pretty much unanimously feared and was a finalist in Consumerists "worst company in america" contest, their branding actually hurts them. So is it a measure of how many people know the brand (which isnt the case with some of the weird tech brands so high), how much money each company makes, or something else? There is simply no possible way ATT has what is considered a positive brand, the only thing they are known for is sucking, Sony was actually booed by a whole auditorium when they announced the Vita would be exclusive to ATT.. booed!
If it is a ranking based on how the brand helps their business then this research company is a joke.