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. To add a link to a mobile phone number, simply select 'phone number' from the drop down menu and type in the phone number (with area code). This will create a link that the user can simply click and it will dial the number.