You can add a link to a phone number.
Step 1. To add a link to text, highlight the text you want to link.
To add a link to a button, simply click on the button to display the options.
Step 2. Want to add a link so on a mobile phone the user can touch the phone number and it dials your number? To implement simply select 'External URL' from the 'Link to' drop down. This will reveal another field where you enter the words tel: followed by your phone number. For example +61 414 227 389 will look like tel: +61414227389