Brunei → Australia
Brunei plugs
Type GAustralia plugs
Type INo shared plug types. A travel adapter is required.
Compatibility: Adapter Required
Voltage — Brunei 240V — Australia 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.