You certainly can publish online documents from InDesign for mobile devices as well. I am sharing few links for more details :
I appreciate the response but maybe my question was unclear. Just like as a URL can be made an active link I want to be able to make a phone number an active link. I don't seem to be able to figure that out.
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I don't believe there is a standard for phone number URLs that work on all platforms. I believe there is a URL for iOS devices. I don't remember what it is. You could search on the Apple web site.
Yes, that's the one. Now not only iOS but also late versions of macOS.
But wouldn't work on Android and Windows, I think.