Mauritania → France
Mauritania plugs
Type C
Type EFrance plugs
Type CType EShared plug types: C, E
Compatibility: Compatible
Voltage — Mauritania 230V — France 230V
Voltage is the same. Your devices should work normally.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.