Second Phone Number funktioniert nicht

The application, developed for mobile business professionals, freelancers and entrepreneurs, allows you to separate business and personal communication and eliminates the need to buy and carry a second mobile phone. Note.  Cellular data is not required: Make and receive calls or text messages using VoIP technology.  Up to 5 phone numbers: Add up to five virtual work phone numbers to your device and receive calls to them from anywhere in the world.  Auto Secretary: Direct your customers to the right channels, such as sales and support, with the Auto secretary feature, as well as on-hold music and pre-recorded call greetings.  Provide your clients with professional communication services no matter where you are, and separate personal and business connections.  You are obligated to ask your mobile operator about their VoIP functions and any additional costs that may arise.  Local and Toll-free numbers: Provide your customers with local or toll-free numbers to call.  Unlimited Calls and Text Messages: Unlimited calls and text messages with voice over IP in the USA and Canada.  Call Features: Track and block unwanted calls with call filtering and blocking.  Your mobile operator may prohibit or restrict VoIP (voice over Internet Protocol) on its network.  In addition, completely free calls and messaging between other users of the application.  This is a full-fledged business phone system in your pocket.  There is no need for expensive cellular data plans or equipment.  You can also transfer your existing phone number to the app.  The application is not responsible for any additional costs for cellular communication that may arise as a result of using the service.