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You can view all of your device's request headers at http://checkyourinfo.com/request


I just checked my AT&T iPhone and it includes a "X-Acr" HTTP header that has a long GUID? Is this a similar tracking ID?


Curious, I don't see this but if that's the same acronym used here it's a tracking ID:

http://www.gsma.com/oneapi/anonymous-customer-reference-beta...




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