Hmm... garbage doesn't work beause they override the UIDH as a MitM. So maybe this fact could be exploited in the opposite direction:
Start using the X-UIDH: header for some prominent but non-mission-critical feature in a format that is obviously not related to this tracking number. When Verizon rewrites the header, that feature breaks, and you can make a fuss about it in the media or sue Verizon for breaking your webpage.
(it sounds good on paper; this may not work in practice)
Start using the X-UIDH: header for some prominent but non-mission-critical feature in a format that is obviously not related to this tracking number. When Verizon rewrites the header, that feature breaks, and you can make a fuss about it in the media or sue Verizon for breaking your webpage.
(it sounds good on paper; this may not work in practice)