Sure you can!
Following are the steps to make it happen:
1- Create a simple form:
- Create a new blank form
- Drag a Textbox (for Name), an Email field and another Textbox (for Phone)
2- Set the rule condition
- Select the “Phone” field in your form.
- Go to ‘Properties panel > Element tab > Settings option > Conditioning category
- Press on ‘Set conditions’ button.
- Set the rule: if current field is not empty
3- Set the Condition Result
- Press on “Click to configure results”.
- Press on “Configure” button in the “Show message” option.
- Enter text for the pop up window title bar.
- Set the width and height of the pop up window.
- Configure the message in the Editor (with the help of HTML).
- Press “Apply” and save the form.
4- Test the form:
- Publish it as URL
- Enter a phone number in the field.
- You will then see your message displayed.