How do I make a phone number a link?

It is possible to code a link for a phone number in HTML - however, this isn't always recognized. (Skype and devices tied to certain VOIPs in particular will need a separate code.)

In general, the HTML code reads as follows:

Email with phone access and mobile devices:

<a href="tel:5551234567">Call (555)123-4567</a>

For Skype and computers without phone permissions:

<a href="callto:5551234567">Call (555)123-4567</a>

Keep in mind, this is only useful for local (not international) callers.