Re: What about VoLTE?
Sure, the content of the calls can be made secure via encryption, but not the information about who you are calling and who calls you. Given the way the NSA determines who to target, in a way that's almost more important than the actual content of your calls.
Granted when the telcos cooperate they will just hand this data over, but presumably not all Euro telcos are as easily bent over as the US ones. With this SS7 attack the NSA can still get this information about who Angela Merkel is calling and who is calling her even if she's got NSA-proof call encryption.