AT&T CEO John Stankey is leaving the door open to more price increases. Speaking at the Goldman Sachs Communacopia + Technology Conference, Stankey said the company’s massive investments in its fiber-optic network are driving benefits to its wireless service. “It’s driving a lot more value back to the customer. They’re using more of the product, they’re relying more on it, and it performs better,” Stankey said. “When you have a satisfied customer who gets more utility out of the service they use, you do have the opportunity to take price in places and you should.”