I work around the Fairfield Commons area and did not ever notice 4G today. In fact, I haven't had any consistent mobile connection for two days! Real disappointing. I was told by customer service that there is a nationwide problem with connectivity, so if some of you are getting 4G in the same neighborhood as me, I have to wonder why I cannot?
Update. It's working in Huber Heights! I picked up 4g on woodman somewhere in the vicinity of eastwood lake metro park. Wasn't paying attention to where exactly, but it's definitely up and running here!