The largest cell phone screen, belonging to the Samsung Galaxy W in 2014, is 7 inches across. An article published by CNET.com reports that the phone appears to be as large as a tablet in size, but still has all of the expected functionality of a modern smartphone.
Unfortunately, the Samsung Galaxy W sells primarily in South Korea. Some phones available in the U.S. market include the 5.7-inch Samsung Galaxy Note 4 and the 5.5-inch Apple iPhone 6 Plus, which both feature beautiful graphics and practical functionality. Very few smartphones meet the sheer size of the Samsung Galaxy W in the United States.