Force mandatory entry on one of two fields on Contacts

Force mandatory entry on one of two fields on Contacts

We are finding our users aren't always entering a phone number or email address of a contact.  We would like to make these fields mandatory but realize they won't always have both pieces of information, but should at least have one.

Is there a way to make either the Phone number OR Email Address fields mandatory on the Contacts screen.  We want to make sure they fill in at least one of those fields.

Is this possible?

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