I make most of my campaigns in the custom code editor. When I use the code <a href="tel:+1-555-555-5555">555-555-5555</a>, the link doesn't work in any browser I test it in: gmail, MacOS, Windows Outlook, iOS. I finally deiced to click the "View as webpage" link and opened the page source. It looks like constant contact automatically changes the <a href="tel:+1-555-555-5555"> code to: <a href="#">. It's as if it detects that the code I used is not a http: or mailto: and "fixes" it to just #.
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