Customer Proprietary Network Information (CPNI) is the data collected by telecommunications companies about a consumers telephone calls. It includes information such as the time, date, duration, and destination number of each call, the type of network a consumer subscribes to, and certain other information that appears on the consumers telephone bill. CPNI may also include account information such as the number of lines. However, CPNI does not include financial information or sensitive personal information such as Social Security Number or credit card information. Privacy rules primarily apply to individually identifiable CPNI, meaning CPNI data that is linked or linkable to a particular person through other data such as a wireless account number, wireless phone number, or email address. Telemarketers or customer service agents working on behalf of telephone companies must go through an additional customer authentication layer (typically a PIN, or last four of the stored payment method) and ask for the customers consent prior to accessing the billing information or before using or sharing that information for any purpose, including but not limited to, offering an up-sell or any change of services.