T-Mobile is crying “collusion” in response to Starbucks’ decision to take on AT&T Wi-Fi service in its stores.

Reuters writes:

T-Mobile is seeking unspecified damages against Starbucks for breach of its contract and unfair competition.

According to a transition agreement reached in February, T-Mobile was given the exclusive right to “sell, market and promote its services” in Starbucks stores until those stores were fully converted to the AT&T system, the lawsuit said.

T-Mo is complaining that AT&T is basically riding on their infrastructure to offer Wi-Fi in stores and is asking for an undisclosed amount.