Comment by jeroenhd

You're gonna need to scan 2^64 addresses once you've located the IPv6 network assigned to my connection before you find my phone. 2^56 if you don't get lucky guessing the network prefix it happens to be on at that moment.

Assuming a scan with a minimum 4 byte ICMP packet, that's about 73786 petabytes of network traffic for that /64. You'll need to shove it down the pipe within a day because IPv6 privacy extensions means the IPv6 address used changes after 24 hours. With only 1gbps fiber, I don't think the deanonimysation is the problem at that kind of traffic level.