A wireless telephone service provider shall provide a contact telephone number and brief description of the service for all third-party billings on the consumer's bill, to the extent allowed by federal law, or through a customer service representative. For purposes of this Section, "third-party billings" means any billing done by a wireless telephone service provider on behalf of a third party where the wireless telephone service provider is merely the billing agent for the third party with no ability to provide refunds, credits, or otherwise adjust the billings.
815 ILCS 505/2WW