Thanks for your answer.
To answer your question, I am mad about this because it is always over complicated to obtain basic information from Vodafone.
My request was eventually answered with the following:
"Good afternoon,
I can well imagine you find this a bit weird, but the rendering is not quite right and you can ignore it further.
You can use your subscription in France as in the Netherlands since France is one of the EU roaming countries 🙂
However, there is a maximum use of data and up to 40gb per month within the EU
This is because of the Fair Use policy that applies to all providers within the EU
I have a link with more information about this but it is only available in Dutch
[link removed to post here]
Best regards."
Checking the page they sent, none of the plans outlined there mention my current plan ('Launch XL').
Moreover, the email says the SMS can be ignored, but it seems they are not fixing it.
The SMS for instance says the phone communications are 0.25 euros per minutes, but the email says the communications are part of the plan and thus should not cause additional charges outside the plan. But since the page does not even list my current plan, I have no way to confirm this or even find the details of the plans tom understand what are the extra costs if any.
So yes, I am still quite unhappy with the info provided by Vodafone support. I find it bad enough they keep coming up with new plan names for similar plans and are unable to keep their site up to date to prevent this kind of misunderstanding.
The website shows:
Start and Red subscription
Red Together subscription
Red Unlimited subscription
Vodafone Prepaid Unlimited
Red Pro Unlimited subscription
Flex Mobile and Business Mobile subscriptions
And my plan is apparently called 'Launch XL' (and does not show anywhere of course. I guess they assume I should find out what this correspond to, but it seems they make it just more confusing for the customer to navigate this and understand what the real conditions are, so I have no clue.
To me, it seems there is no effort to make things simpler or to fix mistakes in the SMS alerts they sent. I did turn off data as soon as I enter France and did not use my phone for the period I am there for this very reason. I hope this will be enough to avoid any bad surprise on the next invoice but I find this whole experience quite terrible from an established mobile provider. I should not have to do this for a simple trip in France.
As I said I will change provider at the end of the contract period (as I always do as staying with the same provider is never rewarded and you are better off changing every 2 years while keeping your number to be able to get the cheaper offers only reserved for new customers only). But this is still about 16 months away.