Greenland → Mayotte
Greenland plugs
Type C
Type F
Type KMayotte plugs
Type C
Type EShared plug type: C
Compatibility: Compatible
Voltage — Greenland 230V — Mayotte 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.