Bulgaria → Tonga
Bulgaria plugs
Type C
Type FTonga plugs
Type INo shared plug types. A travel adapter is required.
Compatibility: Adapter Required
Voltage — Bulgaria 230V — Tonga 240V
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.