Yes, T-Mobile has been doing it for four years now. See slides here: https://conference.apnic.net/data/37/464xlat-apricot-2014_1393236641.pdf https://conferenc

Yes, T-Mobile has been doing it for four years now. See slides here: https://conference.apnic.net/data/37/464xlat-apricot-2014_1393236641.pdf https://conference.apnic.net/data/37/464xlat-apricot-2014_13...