An anonymous reader writes: In March, we discussed AT&T's planned takeover of T-Mobile, and in April, we discussed the Supreme Court's ruling that allows AT&T to enforce mandatory arbitration clauses hidden in consumer contracts. The Supreme Court said the arbitration agreement was “consumer-friendly” because AT&T pays all the fees and guarantees at least a $10,000recovery if the customer wins an arbitration. Now some customers are using AT&T’s own arbitration agreement to try to stop AT&T from taking over T-Mobile. A law firm set up a website to sign up AT&T customers who want to file individual arbitrations to fight the merger with T-Mobile. The site claims that customers may be eligible to recover $10,000 from AT&T.