Compare the plug shapes, voltage and frequency in São Tomé and Príncipe and Samoa, and find out which adapter you need before you travel.
Adapter required
Yes — coming from São Tomé and Príncipe, you will need a travel adapter for Samoa. São Tomé and Príncipe uses Type C/Type F plugs, and Samoa uses Type I, so the pin shapes will not fit any wall socket.
São Tomé and Príncipe (home)
Samoa (destination)
Electrical specifications in Samoa
Voltage
Frequency
More about plugs in Samoa
In Samoa, the standard power plug is Type I. The country runs on 230 volts at 50 Hz. That means every wall socket in Samoa is the same shape — Type I, and your plug needs to physically match the socket to fit.
Full Samoa plug guide