For those who still have doubts, that's what reassure you:
- The phone is a black Samsung S4 16GB original, new, under international guarantee, never unsealed
- The power socket is compatible with outlets in France
- The phone can be set at the first start French (or the language you want)
- Manuals are in several languages (English - German) and all downloadable ways on the internet in French
- It is unlocked any operator
- The updated applications are in French (excluding ROM so), the Play Store is in French once the initial language setting is