Works great with SGS3, (almost) everything which is connected to the mobile phone so that
Pure² High Speed OTG Data Cable - Micro USB HOST cable / for all mobile phones which support OTG like. for Samsung Galaxy S4 / GT-i9500 - Samsung Galaxy Note 2 / Note II GT-N7100 - Galaxy Note 10.1 N7000 i9220 - Galaxy S3 i9300 - Galaxy S2 i9100 - Galaxy Nexus i9250 - Galaxy R i9103 / adapter as with ET-R205U ETR205U or Nokia CA-157 / HTC Sensation XL & XE - Flyer - Evo 3D - and much more. (Accessories) 4
Pure² High Speed OTG Data Cable - Micro USB HOST cable / for all mobile phones which support OTG like. for Samsung Galaxy S4 / GT-i9500 - Samsung Galaxy Note 2 / Note II GT-N7100 - Galaxy Note 10.1 N7000 i9220 - Galaxy S3 i9300 - Galaxy S2 i9100 - Galaxy Nexus i9250 - Galaxy R i9103 / adapter as with ET-R205U ETR205U or Nokia CA-157 / HTC Sensation XL & XE - Flyer - Evo 3D - and much more. (Accessories)
The adapter works great with the Samsung Galaxy S3. So far I have used the a mouse, keyboard, 16GB USB flash drive Canon DSLR camera. What did not work is 3 to connect an old Samsung Galaxy as USB Storage.