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Quick scan of the header logs, these are some of the more obscure headers... (they appear for a tiny fraction of a percent of the total visitors)
X-jinny.cid:
X_UP_CALLING_LINE_ID:
X_UP_SUBNO:
X-London-GUID:
x-wsb-billing:
X-Newrelic-Id:
imsi:
x-uidh:
x-nokia-imsi:
X-UP-NAI:
X-Nokia-IMSI:
X-IMSI:
X-Up-Calling-Line-Id:
X-Nokia-MSISDN:
x-imsi:
X-Unique-Identifier:
X-MSP-CLID:
X-msisdn:
X-WAP-Network-Client-MSISDN:
etc, etc.
All these headers have values that appear to be unique IDs, in some cases possibly a phone number.
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