Vietnam → France
Vietnam plugs
Type A
Type C
Type FFrance plugs
Type C
Type EShared plug type: C
Compatibility: Compatible
Voltage — Vietnam 220V — France 230V
Voltage difference is small. Most electronics will work safely.
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.