São Tomé and Príncipe → Romania
São Tomé and Príncipe plugs
Romania plugs
Shared plug types: C, F
Compatibility: Compatible
Voltage — São Tomé and Príncipe 230V — Romania 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.