When a Student\Individual\Faculty uses a Profile Form (Education Edge), fields which are present for updating phone numbers allow free form text. When processing the resulting profile update transaction in Education Edge, the information is saved exactly as the Student\Individual\Faculty typed it.
These fields are tied directly to the phone fields in Education Edge. The phone fields are designed to allow for free form text for the purposes of allowing both phone numbers and email addresses. It's not possible to force the phone fields on the form to reject non-phone numbers or non-email addresses.