Puerto Rico → Cayman Islands
Puerto Rico plugs
Cayman Islands plugs
Shared plug types: A, B
Compatibility: Compatible
Voltage — Puerto Rico 120V — Cayman Islands 120V
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.