> ...providing the common law grounds for a class-action lawsuit.

This will be fun.

Most (all?) ATT customers have undoubtedly agreed to an updated terms of service contract that contains the "In order to use our Services, you agree to waive your right to trial by jury and class action suit, and agree to use only binding arbitration to settle your disputes with us." language[0] that every company was adding to their contracts after AT&T Mobility v. Concepcion.

[0] AKA: A binding arbitration clause.