What is the display size of Sony Ericsson Satio (Idou)?

The Sony Ericsson Satio (Idou) has a 3.5 inch display.The Sony Ericsson Satio (Idou) display resolution features 640 x 640 pixels, 3.5 inches pixels with a density of 259 PPI, which is 98% average for a smartphone of the same category.