The ticket is only valid when shown on screen.

However, you don't need internet to show a ticket. You only need internet:

1. To activate your pass (only once)
2. To activate a travel day (also on a continuous pass), i.e. when you add the first train of the day to your pass.
3. To generate the QR code (tap on "Show ticket”) after adding the first train of the day
4. Once every 72 hours.

If you do 2&3 for the first train of the day when you still have wifi, then you don't need internet anymore during the rest of the day. You can then add and remove trains as you like; the QR code will remain the same.

Showing the QR code can sometimes take a long time without internet (or with a bad connection). In such a case, turn on airplane mode and it will show instantly.

Thanks a lot:

then…while traveling l should generate a QR code every 72 hours at least, true ?

No, no need to generate a QR code every 72 hours. Just to connect to the internet with your phone (wifi or mobile data, doesn’t matter).

Thanks