Setting up Zoom, device and landline telephone, for a social club of participants

Hi, I recently upgraded from a basic Zoom account to a Pro Zoom account. I was basic for the purpose of connecting with family, all who have smartphones/Computers with Zoom App. I have going to Pro Zoom for connecting with folks in several social clubs that I am a member of. The problem is some of the social club members have only landline telephones or cell phones that are not smart phones. It looks like that Pro Zoom does not accommodate telephone only participants. How do I get these telephone participants connected, is there another plan that will get me there?