Starbucks just began offering free AT&T Wi-Fi service in their stores based on the condition that Starbucks card membership is purchased. T-Mobile says that this move violates the agreement that Starbucks has with their company and has filed a lawsuit seeking damages. The three companies had worked extensively on an agreement to make the transition from T-Mobile to AT&T in a way that worked for everyone; T-Mobile says this offer of free Wi-Fi was made behind their backs and is in opposition to the agreement that was reached. That agreement allowed T-Mobile to exclusively market its services in each store until the transition to AT&T was complete. Since the transition has only been completed in two of the nation's markets, T-Mobile feels that their right to exclusive promotion was usurped.