(Developer and Platinum versions of the plugin)
The "Verification Code" add-on allows verifying the users' emails and phones by sending a verification code and blocking the form's submission until a valid code is entered.
DocumentationEnabling addon

Easy to activate
To activate the add-on, go to the settings page of the plugin through the menu option: "Calculated Fields Form > Addons", tick the checkbox: "CFF-Verification Code" and press the "Activate/Deactivate addons" button.
Verification Code Settings

Verification Code Settings
Tick the "Enable the verification code via email" and / or "Enable the verification code via SMS" checkboxes to enable the email and phone verifications, enter the names of the email and phone fields, and the corresponding texts and messages.
Verification Code In Action

Verification Code In Action
It sends verification codes to the user's email and phone, and opens a validation dialog by pressing the submit button.