Most likely, the carrier's Terms of Service state that you cannot sue you have to go to arbitration or small claims court.
https://www.t-mobile.com/templates/p...sAndConditions
Quote:
"*HOW DO I RESOLVE DISPUTES WITH T-MOBILE?
By accepting these T&Cs, you are agreeing to resolve any dispute with us through binding arbitration (unless you opt out) or small claims dispute procedures, and to waive your rights to a class action suit and jury trial."
Quote from further down the page:
"CLASS ACTION WAIVER. YOU AND WE EACH AGREE THAT ANY PROCEEDINGS, WHETHER IN ARBITRATION OR COURT, WILL BE CONDUCTED ONLY ON AN INDIVIDUAL BASIS AND NOT IN A CLASS OR REPRESENTATIVE ACTION OR AS A MEMBER IN A CLASS, CONSOLIDATED OR REPRESENTATIVE ACTION."