Apple is testing larger screens for both iPads and iPhones, the Wall Street Journal reports. According to company suppliers, Apple has “asked for prototype smartphone screens larger than 4 inches and has also asked for screen designs for a new tablet device measuring slightly less than 13 inches.” The iPhone 5 and fourth-generation iPad have screen sizes of 4 inches and 9.7 inches, respectively; rumors of a 12.9” iPad prototype appeared…