Speaking at the GigaOM Mobilize conference today, T-Mobile USA CMO and executive vice president Cole Brodman indicated that the company will not be offering the next-generation iPhone to its customers when the device launches. ”We’d love to have the iPhone whenever Apple makes that available,” Brodman said, adding that the ball is in Apple’s court. “We are waiting for that phone call.” He went on to say that 75 percent of all devices sold…