Is there a single millimeter wave 5g network deployed in the US? Honestly don't know, but if there is I hadn't heard of it. I suppose there will be in the fut

Is there a single millimeter wave 5g network deployed in the US? Honestly don't know, but if there is I hadn't heard of it. I suppose there will be in the future, but people tend to change phones every couple of years anyway, and Apple has always been shy about being on the leading edge of adoption unproven technology.