Any "Resonable Man"/person argument.
Personally, I think people could get VERY far legally with AT&T by using the "Reasonable Man" argument/assumption in contract law.
-How any reasonable man or person would read their contract and would view what the company is going to do, when they use the wording "Unlimited" is how the decision would be made.
I think any reasonable person would read "unlimited" as NOT being limited in any way! By those definitions and the fact that it is small claims, the plaintiff (guy winning $850) is not bound to show or know, absolute precedent to win the case. That is why small claims courts are not Precedent setting. (legally speaking) As long as he has a "reasonable argument" anyone can win in small claims court unless the defendant can actually bring precedent to overrule certain arguments.. Even so, small claims, tends to make the legal system less intimidating for the "Layman. And side with the smaller party (manytimes).