Calling into a zoom call

Welcome to the Zoom Community, @EBCO.

When setting up your meeting, be sure to select "Both" to enable the computer and telephone options for audio:

If your attendee is not located in the country/countries shown, click on the pencil image to change which country's phone numbers are listed in the invitation.  This list does NOT restrict which countries can be called from... that list is given in this Zoom Support article:

https://zoom.us/zoomconference 

Note that some countries and all toll free numbers require an extra subscription by the meeting host, and that some countries simply do not have local calling available.