Not entirely seamless. It creates a hard-fork of your user account if you choose not to notify others of the number change (effectively cutting you off from con

Not entirely seamless. It creates a hard-fork of your user account if you choose not to notify others of the number change (effectively cutting you off from contacts). That's only one aspect, however. Most WA features have a diminished experience due to their early design choices centered around a phone (see WA web vs Messenger or Telegram web)