I live in Portland, Oregon, where AT&T recently enabled voice over LTE, but I am not getting it on my phone. My friend who has the same phone as me gets it just fine. I do have my original phone number, which has a California area code. Might this be the issue? Is AT&T enabling volte by area code and not the towers the phone is connecting to? If so, is anyone aware of a workaround? I do not want to change my number just for volte, but would like to use it since I have the equipment (iphine 6 plus) to support it. Thanks!