AT&T (T) has been ramping up its LTE rollouts over the past week in anticipation of Apple’s (AAPL) first LTE iPhone. As AppleInsider reports, AT&T has officially launched LTE in 10 major markets over the past week, including Cincinnati, Philadelphia, Pittsburgh and Seattle. The addition of 10 new markets means that AT&T now offers LTE services in 72 major markets, and the company has promised to add several more big markets such as Denver and Detroit by the end of the year.