As of now, WhatsApp requires a phone number to connect to one iPhone of Apple, and while this device can be used to connect to a desktop application or the Internet, you cannot use the same account on another phone without transferring the number. So if you lose your number, you also lose your account in the application.
Based on the screenshots shared on WABetaInfo, this could soon change. The images show that the interface of the connected devices being tested is similar to the way users connect their account to version of the web application.
The feature is currently hidden in the beta, so no one can use it. Whether it will be revealed in a future beta or done directly in a public release is a matter for us after the tests, if WhatsApp decides that something is possible.
Therefore, the service developers are working hard to bring the new features. Earlier this month, WhatsApp launched a number of new features in its mobile, web and desktop variants, including the option QR code scanner for contacts and a new dark running theme that extends to computers.