I recommend asking at https://projectdmc.org/support/plugin/wp-call-button/ so the plugin’s developers and support community can help you with this.
I just checked the link out, and there is a similar question from over a year ago, it looks like they don’t answer many queries, a lot are unresolved. Any other ideas on this one?
Not really, only the developers of the plugin can help with that change.
Perhaps it’s time for a different plugin? https://projectdmc.org/plugins/search/call+button/
Thanks for this, but I have Google ads running with a third-party company and they have added code to my site, so they can track phone calls from the site. I probably can’t change the plug-in at the moment, and also it might have the same issue as the WP Call Button, with no alt text for the image they use. I would prefer to leave WP Call Button in place. It’s just annoying that they don’t reply. I might send a message to them anyway but it will probably be unanswered. So frustrating. But thanks for your help.
Thread continues at https://projectdmc.org/support/topic/no-alt-text-for-the-call-button-image/