The Helsinki Transport Authority (HSL) has become stricter about issuing fines for tickets purchased on the app after the bus or tram has started moving.
I don’t know if this works with HSL, I have never travelled by their things when visiting Helsinki. But with all my tickets, Matkahuolto or VR, I always just take a screenshot of my ticket and crop it. So before hopping onto the bus/train, I can safely open the photo from gallery and then reopen my phone once someone wants to see the ticket. No need to worry about any app lagging or suddenly not working or logging me out from my account and so on.
I don’t know if this works with HSL, I have never travelled by their things when visiting Helsinki. But with all my tickets, Matkahuolto or VR, I always just take a screenshot of my ticket and crop it. So before hopping onto the bus/train, I can safely open the photo from gallery and then reopen my phone once someone wants to see the ticket. No need to worry about any app lagging or suddenly not working or logging me out from my account and so on.