Premier Ford indicated Friday that Ontario will join a nationwide smartphone app program designed to help trace contacts of those who fall victim to COVID-19. The app makes a digital handshake with other phones carrying the app as their owners go about their business when away from home. If anyone on the digital list of contacts falls victim to the virus, health authorities have a quick way to warn all those who came in contact. Ford said all premiers agree there should be a common app and officials are now working on that. One app already in use is AB (Alberta) Trace Together. Here’s how it works.