So, you are dependent on the ISP cooperating to give you privacy? What could possibly go wrong? Downvote me all you like guys. This just proved my point. NSA will love IPv6 adoption.
That sounds a bit disingenuous. IPv4 was always on a forced rotation because a) limited address space and b) ISPs wanted to milk customers for static IP charges. IPv6 eliminates a). That leaves b) which isn't really a factor on mobile devices. It really is a permanent cookie if the ISP decides to implement it that way. I can't say I trust AT&T and Verizon after their 'header enrichment' shenanigans.