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Click Settings (a wheel button) next to "Log out". Find phone numbers on that page.
To change your primary phone number, you’ll need to add a new one in that category (home, mobile) and mark it as yours primary number.
After that you can delete the previous number.
If you go to the 'Help & Contact' icon on the PayPal website. Then if you click the 'Contact Us' link at the bottom of the page. From here, if you click the 'Password and Account Access' option, then 'Login Problems'. On the next page, you will see a 'Call Us' option. You do not need to be logged in to use this feature.