From AT&T Customer Proprietary Network Information or CPNI page:
AT&T companies that provide telecommunications and interconnected Voice over Internet Protocol (VoIP) service (which permits VoIP customers to both send and receive calls to/from customers with traditional telephone/telecommunications service) would like to share your customer proprietary network information within the AT&T family of companies for our own marketing purposes, including using that information to offer you additional products and services.
You can opt out of this service by going to www.att.com/ecpnioptout.
If you’re Verizon customer, you can also opt out.
It is unclear if iPad users on Verizon are affected by this. Verizon would not allow users to register iPad on My Verizon. Verizon requires user to register to My Verizon before they can review their privacy settings.
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CoC: