Android marketplace( Google Play) shows Skype voice and video calling supported for Samsung Galaxy Y: Android-2.3.6( Gingerbread). But actually it only supports voice calls. The reason is that Galaxy Y doesn't have front camera and 832MHz processor( comparatively low speed). But I must say voice call quality and experience is nice. I am sharing details about voice calls based on my Skype voice call experience with 2G data network.