ios 9.1 and all my calls are going over LTE here in midtown. First time experiencing this on AT&T Just to update this post. I live in Brooklyn. On my commute back home I was on a lengthy call over LTE. Hung up and called another number and it dropped down to 4G again. The call did stay on LTE the entire ride though. Looks like this is exclusive to Manhattan only, and I will be able to confirm when I go back tomorrow.