1. Create a formula to include text with the Phone number if if the phone number exists. Example: IF NOT IS NULL({Phone number Field}) THEN "Phone:  " + {Phone number Field} ELSE ""
  2. Insert a text box
  3. Drag and drop the new formula field in the text box
  4. Right-click on the text box and choose Format Text
  5. Check the box to Suppress Embedded Field Blank Lines
  6. Click Ok