I'm almost afraid to share this workaround because Verizon will surely close this loophole, but there IS a way to (temporarily, at least) suppress the X-UIDH without resorting to using an always-...
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I'm almost afraid to share this workaround because Verizon will surely close this loophole, but there IS a way to (temporarily, at least) suppress the X-UIDH without resorting to using an always-on VPN: From my testing, I have found that if my phone initially associates to the network in EVDO mode (3G), it does not get assigned a X-UIDH value. If the phone initially associates in LTE, the value gets assigned. Here's the kicker: once it's established in 3G, you can then switch on 4G and it will switch to LTE without the X-UIDH being assigned. My Droid running KitKat will not allow me to force it to use 3G only. However, I was able to download an app from the Play store (link at bottom) that takes me to the Phone Information/Preferred Network type settings. Dialing *#*#4636#*#* will do the same thing, but it was disabled on my phone. From there, I scrolled down past the network info and set the drop-down option for "Set preferred network type" to "GSM/CDMA auto (PRL)" to force it to 1X/EVDO mode. This causes it to reassociate to the tower and drop down to 3G. I then checked at lessonslearned.org/sniff to verify the X-UIDH was not present. Once I confirmed it wasn't, I went back to the options and set the radio back to "LTE/CDMA/EvDo/GSM/WCDMA". The phone switched to 4G, but since it was already associated with the tower, it did not pull an X-UIDH. I re-verified that the tracking header was not present. Boom. 4G without Verizon spying on you. If you lose signal or it has to do a "cold" tower association in 4G mode, it WILL pull an X-UIDH. Simply repeat the process to remove it. I will need to do further testing to determine how it handles tower-handoffs and such and whether it will pull an X-UIDH value at that point. I shouldn't have to say this, but change the radio settings at your own risk, blah, blah blah. These settings worked for me and should work for most 4G phones, but you should have at least a little knowledge of what you're doing before you try. I don't believe you need to be rooted to do this. App Required: https://play.google.com/store/apps/details?id=de.mangelow.network Also, I've filed FCC, FTC, and BBB complaints and keep getting the same canned response. I'm in the process of arbitration with the BBB, but I doubt that'll do much. Writing my representatives and attorney general next.