Thee phone links are not working – tried it on iPhone and iPad.

Thanks

I don’t know if I’m doing something wrong or maybe it doesn’t work with my theme or other plug-ins. I have a lot of phone numbers in my site. None are clickable on mobile. Is there a way to turn this on, or point it to phone numbers to make them clickable? How do I know when it is active to try to understand why it isn’t doing anything. Hope you can help.