The Samsung Galaxy 5 is also know as the i5500, i5503, or Europa. Only use this tag when your question is specifically about this phone.
The Samsung i5500 is also named Samsung Galaxy 5, Samsung Galaxy Europa, Samsung Galaxy 550, Samsung i5503, and Samsung Corby Android in some countries.
Samsung Galaxy 5 i5500
It ships with Android 2.1 Eclair (or 2.2 Froyo) operating system. Full device specs can be found at GSMArena.