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I'm afraid we do not have any built-in functionality for using XVerify phone validation services, we can only verify email addresses at this time.
This sounds like a useful addition, however, so I have escalated this thread to our developers as a feature request.
While we cannot provide you with any kind of estimates as to when such a widget might become available, as that will depend on workload and other priorities of our developers, rest assured that we will notify you through this support thread as soon as such a functionality becomes available.
In the meantime, I would recommend that you check out our SMS confirmation widget instead - it uses Twilio for confirming whether a number is valid: