Located on the Contact Info tab, you can use this Condition to find people based on their Cell Phone number. Note the Comparisons below. 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 cell phone number.
Enter the number without punctuation: example - 9015551212
To find those without a Cell Phone, use Equal and put nothing in the Value field.