Displaying the store telephone number that you entered into the Magento Admin seems like it should be obvious but it took me ages to track down, here is how.

In a template file you add the telephone number by calling getStoreConfig like this…

<?php echo Mage::getStoreConfig('general/store_information/phone'); ?>

But from within the CMS, it is much simpler – there is actually a link to insert it somewhere in the menu that generates the following code…

{{config path="general/store_information/phone"}}