There are a number of different groups doing tests of smartphone and tablet screens, and results often vary from one to the next, but there is general agreement that the Galaxy S5 has one of the best screens of any mobile device. DisplayMate corporation, an acknowledged leader in the field of display testing, said of the S5's  1920x1080 pixel screen:
... The Galaxy S5 is the best performing smartphone display that [DisplayMate] has ever tested. It has a long list of new records for best Smartphone display performance including: Highest Brightness, Lowest Reflectance, Highest Color Accuracy, Infinite Contrast Ratio, Highest Contrast Rating in Ambient Light, and smallest Brightness Variation with Viewing Angle. the Galaxy S5 has raised the bar for top display performance up by another notch.
But that screen is now older tech. Samsung's Korea-only  Galaxy S5 LTE-A squeezes 2560 x 1440 pixels into the same 5.1 inch display space. It's expected this screen technology will also appear in the soon to be released Galaxy Note 4, and the rumored Galaxy S5 Prime / F / Alpha.So how good is this new screen? Very good indeed. According to Anandtech, which has just tested the display on the S5 LTE-A, the new display performs better than the S5's display in virtually every category. In terms of color, greyscale and saturation accuracy the new screen technology improves on the old.  Only in brightness did Anandtech find the older display superior, and in that only slightly. Given that the S5 is already one of the best in terms of sunlight visibility, the slight loss of brightness is probably not important.The increase in resolution of the new screen may not be very significant in and of itself, and may not be readily visible to most users in most situations. But combining higher resolution with improvements in virtually every other aspect is an impressive achievement. The only remaining question is battery life. Quad HD resolution LCD displays require significantly more power than HD displays, but there are hints that Samsung's Super AMOLED Quad HD screen is as efficient as the S5's HD version.   We can't wait until devices with this display appear more widely. 

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What's my model number?

There are several ways to locate your model number:

Option 1
On your device, go to Settings, then "About device" and scroll down to "Model number"
Option 2
Often times you can view the model number inside the device, by removing the battery
Option 3
Using Samsung's model/serial number location tool

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