Using the Crater Editor you may add your phone number to a publication so users can directly call you by clicking the hotspot. Follow the steps to add a phone number:

1. Select the Hotspot Tool on the left toolbar.

2. In the Hotspot properties, open the General hotspots, and then choose the Phone number option.
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3. Enter the phone number.

4. Click Add to page.
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5. Move the element to the place you wish and drag the corners of the element to resize it.
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Don't forget to save your page when you're done.

Learn more about adding hotspots to your publication.