Can I use the NHS Online: 111 app outside North London? You can use the NHS Online: 111 app outside of London if your home postcode or the postcode of your registered GP in in the pilot area. Please check to see if they are here. Related articles Am I eligible to use the NHS Online: 111 app? What is the NHS Online: 111 app? If I join Babylon, will it deregister me from my NHS practice? I receive Babylon through BUPA, which app should I download? What is Healthcheck and how does it work?