An anonymous reader writes to let us know that Verizon Wireless is planning to share its customers' calling records
(called CPNI) with "our affiliates, agents and parent companies (including Vodafone) and their subsidiaries." The article explains that CPNI "includes the numbers of incoming and outgoing calls and time spent on each call, among other data." Some subscribers, it's not known if it's all of them, received a letter in the mail giving them 30 days to opt out of this sharing by calling 1-800-333-9956. Skydeck, a mobile and wireless services company, seems to have been the first to call attention to the Verizon initiative
on their blog; they also posted a scan of the letter
(sideways PDF) from Verizon.