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.
3. Enter the phone number.
4. Click Add to page.
5. Move the element to the place you wish and drag the corners of the element to resize it.
Don't forget to save your page when you're done.
Learn more about adding hotspots to your publication.