Hello @GraceK1. We do not have a way to sort contacts by phone number in the account. However, if you were looking for a specific area code, you can do an advanced search for numbers that begin with that area code. Other than that, you can export your contacts and include phone numbers in the report. From there, you would have to manually sort contacts by the phone number. I will put feedback into your account in regards to being able to sort by phone number.