The Wall Street Journal‘s Ian Sherr just reported via Twitter that Apple is testing iPhones with larger screens, in some cases much larger – up to 6-inches.
Of course, Apple has likely tested iOS devices with screens ranging from 1- to 100-inches, but that doesn’t mean sizes not on the market now are coming, or will ever come, to market.
https://twitter.com/iansherr/status/375718305144639488