Grenada → Isle of Man
Grenada plugs
Type GIsle of Man plugs
Type GShared plug type: G
Compatibility: Compatible
Voltage — Grenada 230V — Isle of Man 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.