The verbiage from their privacy policy is,
In providing services, "we may collect certain information that is made available to us solely by virtue of our relationship with you, such as details regarding the telecommunications services you purchase, including the type, destination, technical configuration, location and amount of use of such services. This information and related billing information is known as Customer Proprietary Network Information (CPNI). ...
"In order to better serve your communications needs and to identify, offer and provide products and services to meet your requirements, we need your permission to share this information among our affiliates, agents and parent companies (including Vodafone) and their subsidiaries."
(emphasis added)
The policy blog link says basically that the information in question doesn't go outside of the Verizon group of companies.
Given that your experience of how they implement their policies does, in fact, truly follow that statement, then I'll accept that the information doesn't go outside of the Verizon group of companies.
I still end up with two objections -- their use of the word "affiliates" and their sharing of location and call history among this broad group of companies.
Fifty-five percent of Verizon Wireless is owned by Verizon Communications, and 45% is owned by Vodaphone group, so the phrase "parent companies ... and their subsidiaries" already includes a wold-wide network of telecommunications companies. In fact, that's really what I'd call the "Verizon group of companies."
Perhaps there's a legal meaning to the word "affiliates" that I'm not aware of, but the word affiliate, as defined (see
affiliate) connotes being a member of a club more than being part of a legally owned group of companies. But if "affilates" does have a legal meaning that goes beyond the common usage, why not use a phrase that can be commonly understood instead? And given that the phrase "parent companies ... and their subsidiaries" already includes every company owned by Verizon Communications and Vodaphone Group, then why even have the word "affiliates" at all?
My second objection is related to the nature of the information they're passing around -- I don't really want my locations, in particular, passed around among the web of subsidiaries of Vodaphone Group and Verizon Communications (and I wouldn't be thrilled about my call history being passed around either). The policy blog specifically mentions offering bundled packaging (land and wireless service, for example) to customers. This could be offered WITHOUT sharing CPNI information, and by only sharing billing address and/or home address information. I find the PolicyBlog response insufficient, at best, and I would still opt out if I were a Verizon customer.