Yes, I believe that this is possible with the French banks, but of course I can't guarantee it, and I've never been in France for any length of time. I don't see the problem with the bank either, because as long as you have an account in the country then you have a residence in France and therefore a postal address, these are points where the bank is interested. What else the bank is interested in is important in the financial sector, e.g. regular salary, etc. I don't see any problem at all with the mobile, but I or my wife use it in Costa Rica and it works without any problems there. you just have to do everything exactly when installing it and one thing at a time. also check whether it works, the restart until synchronisation, that also works much easier if you do this in the same country where you live, which in this case would be France. Under no circumstances should you do this in Switzerland first, as this can lead to problems because you will still have Switzerland stored as the country where possible. There are also more problems when you change countries, as I always have problems because nowadays the supposed security checks are "over" -checked and then Switzerland interferes when you are in France and vice versa. This is of course not the case when you go on holiday for 2-3 weeks and I am in Switzerland for 1-3 months and in Costa Rica for 3-7 months. You should also have the bank in the same country where you live and I spend money and register your mobile.