At WinHEC, Microsoft revealed the minimum hardware requirements for Windows Mobile, that is Windows 10 for phones. This is more or less same as the previous Windows Phone 8 hardware specs. Minimum RAM remains 512MB, storage remains 4GB and power, volume up/down buttons are required. Another interesting thing is the display size which can now go up to 7.99 inches. Also, Microsoft now requires minimum RAM for devices based on display resolution. For full HD display devices, 2GB RAM is required and for QHD displays, 3GB RAM is required. Find the full list from the above image.