Samsung Galaxy S IV or S4- Samsung's flagship model in 2013. With 1920x1080 resolution and 13 megapixel camera. Features a 2 megapixel front camera and the model is available with 16, 32 or 64 GB of storage memory. S IV can also handle memory cards up to 64 GB. The back cover is made of plastic and just like the S3, you may replace the battery if needed.