first interrail trip

You can share the entire trip, which he can then save on his phone and then connect with his pass.

He'll have to do the activation of the pass and the travel days himself.

Please do note that it is not recommended to activate your pass or any travel day in advance. You may think everything is fixed, but unexpected things can always happen. You can only cancel activation as long as validity hasn’t started yet, which is at midnight. If e.g. you wake up ill on your planned start date, then it will be too late to cancel, the clock will start ticking and you may loose travel days. It's OK to try the app out (choose a start date well in the future) but after that it's best to cancel pass activation until the day you start your trip.

Also please note that the planner in the app is known to be incomplete, out of date and generally not reliable. The operators’ own planners are most reliable. For international planning, bahn.com or the DB Navigator app is a good choice. In any case, always verify your plan a few days in advance with the operator's planner, because there can always be changes, especially if you planned a long time in advance.

Ok, many thanks for that. Everything is planned from hotel and apartment bookings, to day trips, so I think its unlikely to change  but i understand your point. We travel in 3 days, so I would want it activated and ready to go for our 6am start.

I am concerned about the fact that the times maybe wrong, do the sites you mentioned show the full European trains? Several of our trips are across borders with connections? I also have paid reservations on some!

bahn.com should have the same coverage as the Rail Planner app, but is just more up to date.