How to Get an eBay Member's Phone Number
To get an eBay member's phone number, click the Advanced Search link next to the Search box and then click the Members: Find the Contact Information link on the left side of the screen. You need to enter the seller's User ID and the number of the item that you're trading with the other member; then click the Submit button.
eBay automatically generates an e-mail to both you and the other user.
eBay's e-mail includes the seller's User ID, name, e-mail address, company, city, state, and country of residence, as well as the seller's phone number and date of initial registration. eBay sends this same information about you to the user you want to get in touch with.
Often, sellers jump to attention when they receive this e-mail from eBay and swiftly get the ball rolling to complete the transaction.
eBay doesn't tolerate any abuses of its contact system. Make sure that you use this resource only to communicate with another user about a specific transaction. To use contact information to complete a deal outside eBay is an infringement of the rules. If you abuse the contact system, eBay can investigate you and eject you from the site.