Your MultiLine number is the product of a unique patented technology created by Movius. Your MultiLine number is a real, carrier-grade number. This means that unlike with VOIP, you don't need an Internet connection to make calls.
As part of this technology, when you use your cell network to make the call (Movius Minutes Mode) you may see a "pilot number", a number you don't recognize on your outgoing call screen or in your personal call log. Rest assured that these pilot numbers only help the MultiLine mobile app route your call through the cellular network to the Movius cloud service; you are calling the correct party and they will see your MultiLine number.