First, let’s talk small. At just 3.5 inches, the iPhone 4 (and earlier) is relatively small compared to most higher-end phones on the market, yet it’s immensely popular. (Technically, the iPhone 5 has a 4-inch screen, but it’s just longer–not wider–so that doesn’t really count.) Apparently, then, that’s a good baseline for an acceptable screen size for a large swathe of the mobile market.

via Smartphone Screen Real Estate: How Big Is Big Enough? – HotHardware.