I actually read the updated Agreements and Policies that get sent to me, even if it takes a while. In their Sept. 14th mass e-mail was the cute little provision that forces me to either accept the charges for calls and texts made to my cell phone or to remove it from my account:

Provisions relating to eBay's contacts with its members.

Pursuant to the eBay User Agreement, you agree that eBay, its affiliates, agents, and independent contractors may contact you at any telephone number you provide to us or from which you place a call to us, or any telephone number at which we reasonably believe we may reach you, using any means of communication, including calls or text messages using an automatic telephone dialing system and/or prerecorded messages, even if you incur charges for receiving such communications.
You also agree that eBay may monitor or record telephone conversations with eBay or its agents for quality control and training purposes or for its own protection.