Do NOT use the REServ way via app etc-it simply leads to too many problems
Best way in FR is when IN the country via a machine (for a few days later) or CALL SNCF on its /en/ line. Untill end of covid these were assumed to be able to change (same route only perhaps other date/time) for free at a counter, but I dont know actual situation-if this has changed. Also DO note that its mandatory for all its fast TGV and IC-trains but NOT for the many more TER locals-they may be slower, but often you can do same trip. Its 10€ when you are lucky to be IN the quota for passes, and 20€ out-untill fully booked. Though I suspect the quota is 0 on very populair days/times/routes.
And also-as so many seem clueless: it really is ONLY IN France valid-not on sections out of FR even when its still the same TGV. Ans 1-country is NOT for sale to French people!
Due to rather small quota it may very well be that you got a 10€ for 1st booking, but if you want to change, the other train has no more-then you have to pay 10 extra to reach 20! IF it works with refund the other way-possible as such-I really dont know
Do NOT use the REServ way via app etc-it simply leads to too many problems
Best way in FR is when IN the country via a machine (for a few days later) or CALL SNCF on its /en/ line. Untill end of covid these were assumed to be able to change (same route only perhaps other date/time) for free at a counter, but I dont know actual situation-if this has changed. Also DO note that its mandatory for all its fast TGV and IC-trains but NOT for the many more TER locals-they may be slower, but often you can do same trip. Its 10€ when you are lucky to be IN the quota for passes, and 20€ out-untill fully booked. Though I suspect the quota is 0 on very populair days/times/routes.
And also-as so many seem clueless: it really is ONLY IN France valid-not on sections out of FR even when its still the same TGV. Ans 1-country is NOT for sale to French people!
Due to rather small quota it may very well be that you got a 10€ for 1st booking, but if you want to change, the other train has no more-then you have to pay 10 extra to reach 20! IF it works with refund the other way-possible as such-I really dont know
So, as you say, I have to pay for a seat reservation on Intercite trains (IC trains)? I thought it was only applicable on TGV trains (in France).
PS: I do not live in France, so the One Country pass for France is no issue
If ‘Unlimited Exchange’ option is available at the time of the seat reservation (High Flex), does it mean that I can change my travel time as much as I want without any extra cost?