You can contact a person directly by phone to request an informational interview.
The best days and times to call are Tuesday through Thursday, near the start of the workday (typically about 9 am), or near the end of the workday (typically about 5 pm).
The script for your phone conversation is simple — discuss the same content in the same order as the sample emails on this site. Check out this link:
5 Sample Requests for an Informational Interview