In order to set commands up to send alerts via SMS or phone call you will need to create a Command.
In the left hand menu choose Command > Add command
Fill in the basic details
Scroll to the bottom of the page and you can create your formula.
If [sensor A] [<=>] [insert value] then choose how you want to be alerted. Options are Email, SMS or Phone call.
*Important: ensure your have verified your phone number if you are to receive SMS or Phone call alerts