Greece → Sri Lanka
Greece plugs
Type C
Type FSri Lanka plugs
Type GNo shared plug types. A travel adapter is required.
Compatibility: Adapter Required
Voltage — Greece 230V — Sri Lanka 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.