Sarah Tew/CNET

Apple is testing versions of its iPhone and iPad with larger screens, according to The Wall Street Journal.

The gadget maker has been testing iPad screens in recent months that measure almost 13 inches diagonally and iPhone screens larger than their current 4-inch size, The Wall Street Journal reported Sunday.

CNET has contacted Apple for comment and will update this report when we learn more.

The WSJ report appears to buttress reports last month that Apple was exploring iPhones with screens as large as 5.7 inches. Reuters reported in June that the company was considering the introduction of "at least two bigger iPhones next year," one with a 4.7-inch screen and the other a 5.7-incher.

Observers theorize that Apple has been looking to install a larger screen size on the iPhone to attract consumers smitten with Samsung's 5-inch Galaxy S4 and 5.5-inch Galaxy Note 2.

Some Asia-based reports hold that Apple has decided to delay the iPhone 5S in order to switch to a larger screen size. The 5S was expected to hit the market in September or October but has been pushed back to the end of the year to allow Apple to increase the screen size from 4 inches to 4.3 inches, the Commercial Times reported last week.