Remember AT&T Mobility's (NYSE: T) purchases of 2.3 GHz WCS spectrum? The carrier will finally start putting those airwaves to good use for LTE service starting this summer, according to AT&T's Tom Keathley. The rollout will start over the summer but will ramp up throughout the rest of the year and into 2016, according to Keathley, senior vice president of network and product planning at AT&T. The 2.3 GHz spectrum will primarily be used to add extra capacity to AT&T's network and will be deployed in dense, urban areas, Keathley said. To find out more about AT&T's 2.3 GHz plans, check out this FierceWirelessTech article.