To search for contacts without a phone number or without an email address, login to your FullContact Web App account and then open the Tags drawer at the top right corner of the page. In the list, you will see Smart Tags section with Business Cards, Email Signatures, Missing Name (first name), Missing Organization, Missing Email, and Missing Phone. By clicking the respective Smart Tag, we will display all contacts in your FullContact account with the aforementioned missing info.
You can also add more than one tag to improve the search.
You can learn about our advanced search operators here.