IPv6 over LTE... here again, gone again
When I got my iPhone 5, I was pleasantly surprised to discover it supported IPv6 over LTE. About 5 days after I got it, they released Carrier 13.1 (to replace Carrier 13.0), and IPv6 support disappeared.
When iOS 6.1 came out, I once again was pleasantly surprised to see IPv6 support had returned. Not only that, but it worked perfectly with tethered devices as well - they each got a proper, native IPv6 address and could use it.
Today, Carrier 14.1 has been pushed out, and once again, IPv6 support has been disabled.
Come on, Apple, stop teasing us. It's just mean.