There’s a really practical reason as to why Apple thinks that a mobile phone touting a display larger than 3.5 inches is actually useless. After reading this post you’ll probably get rid of that Galaxy S 2 with the huge 4.3 inch screen. Normal human beings don’t use all 10 fingers at one go, while using the phone to make a call, reply to text, look something up or any regular gesture.
All of us normally use our thumb finger most of the time. Why? Because it is easier to do so and this way, you can also hold your phone securely in your palm. Now, go hold your 4 inch device and try reaching the top corner of the screen with your thumb, unless you’re one of the Fantastic 4′s, this is not normally possible. This is where display size matters.
A mobile device that has a 4 inch or larger display is practically useless, since you’ll not be able to reach all the areas of the magnificent AMOLED or IPS touchscreen without risking to drop it. Here’s a piece of information from Designer Dustin Curtis who believes;
Touching the upper right corner of the screen on the Galaxy S II using one hand, with its 4.27-inch screen, while you’re walking down the street looking at Google Maps, is extremely difficult and frustrating. I pulled out my iPhone 4 to do a quick test, and it turns out that when you hold the iPhone in your left hand and articulate your thumb, you can reach almost exactly to the other side of the screen. This means it’s easy to touch any area of the screen while holding the phone in one hand, with your thumb. It is almost impossible to do this on the Galaxy S II.
As you can see, in the above screenshot, this is actually very true. Now, go try it on your phone, if you have a device that has a display anywhere south of 4 inch, it’ll be really easy to use with one hand. But, a 3.5 inch display is actually the best to go with. When Apple recently introduced the iPhone 4S, people were really disappointed that it carried the same design and screen size. Now you know why Apple products actually make sense. Having a big screen is very pointless, unless you have nothing else to do with your other hand or are watching movies and playing games on it.
This is why Apple chose to stick with a 3.5 inch display and maybe, even the iPhone 5 will sport a display smaller than 4 inch, or maybe they’ll come up with something out of the world.
Don’t you think a phone with a large display is actually a pain to use with one hand, because that’s how normal phones are used.