I had to go to Sturgis, SD from Northfield, MN this last weekend. When we got past Sioux Falls, I had no service the rest of the trip. Even when we spent a couple of days in Sturgis. Is coverage in that state that poor or is it my phone? I have an iPhone 5 and I was wondering if it’s because it’s now too old for the latest iOS 11 update. That can’t be. My friend has an old flip phone with AT&T & was able to make & receive calls all the way(it seemed).