mobile.2.ts

type Valued<T> = { value: T }
type ConfirmedMobile = Valued<string> & { status: 'confirmed' } 
type UnconfirmedMobile = Valued<string> & { status: 'unconfirmed' }    
type Mobile = ConfirmedMobile | UnconfirmedMobile
type User {
  /* name, surname, etc */
  mobile: Mobile
}

// an user with confirmed mobile
const User1 = {
  name: 'Mario',
  mobile: {
    status: 'confirmed',
    value: '123456789'
  }
}

// an user with UNconfirmed mobile
const User2 = {
  name: 'Luigi',
  mobile: {
    status: 'confirmed',
    value: '987654321'
  }
}