Ah, thinking about it, this plan probably wouldn't work. Its easy enough for them to require sites wanting this ID to opt-in and then only supply the header to

Ah, thinking about it, this plan probably wouldn't work. Its easy enough for them to require sites wanting this ID to opt-in and then only supply the header to the white-listed sites. Though reading more, sending fake X-UIDH headers on non-Verison traffic could be effective: the consuming sites need to make paid calls to a Verizon service to resolve the token in the header to an identity. Extraneous tokens could cost advertisers money.