Ionic web page navigation and hardware back button

Hi, I am building a browser web page using ionic 2. I use a navigator to navigate from ionic page to ionic page. It works well using the navigator bar that is created at the top. When I change pages I can go back using the arrow on the left of the navigation bar. But if instead I use the phone’s hardware back button, it exit my web page completly! How can I make the phone’s back button navigate back through my ionic pages?