The Interrail system requires verification of your mobile pass at least once every 3 days to ensure its validity and prevent fraud. Therefore, you need to open the App and connect to the internet at least once every 3 days. The App does not update itself automatically in the background. Additionally, the App will send you a reminder 24 hours before the 3-day internet connection period ends.
If you fail to open the App with an internet connection for more than 3 days, your mobile pass will become inactive. This means that you will no longer be able to use the pass offline, and you must open the App with an internet connection to reactivate it. Please note that it may take a few minutes to reactivate your pass in the system, so keep the app open for some time after reconnecting.
Some trains in France and Germany, particularly high-speed trains, offer Wi-Fi internet connections for passengers. It may be helpful to check if this option is available while traveling. Remember to keep the notifications enabled in the Rail Planner App to receive reminders when you need to connect to the App (requiring an internet connection every 72 hours).
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