Thailand → Guernsey
Thailand plugs
Type A
Type B
Type C
Type OGuernsey plugs
Type GNo shared plug types. A travel adapter is required.
Compatibility: Adapter Required
Voltage — Thailand 220V — Guernsey 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.