I'd argue the infrastructure between phone numbers and e-mails are different enough that filtering for fake phone numbers is easier. You can look up carrier da

I'd argue the infrastructure between phone numbers and e-mails are different enough that filtering for fake phone numbers is easier. You can look up carrier data on a phone number easily enough, and if you're in the industry you have a general idea of which carriers are the ones that actually follow the rules for registering a number. You filter on the ones that don't.