Located on the Contact Info category tab in Search Builder this Condition allows you to find people based on their Work Phone number.
You can use ‘Starts With’ to find numbers based on the first digits in the phone number, such as 901. You can also search by part of the number: Contains 1194 - to find everyone with those digits in their work phone number.
You must enter the number without punctuation: example - 9015551212
To find those without a Work Phone, use Equal and put nothing in the Value field.