Samsung G3812B Galaxy S3 Slim official Pictures. Samsung G3812B Galaxy S3 Slim is a Smartphone of samsung. The Samsung G3812B Galaxy S3 Slim Android Smartphone. Announced Mar 2014. Features 4.52″ Display, 5 MP Primary Camera, 2100 MAh Battery, 8 GB Storage, 1000 MB RAM. Samsung G3812B Galaxy S3 Slim price starts.