4 - 4.3 inches is the most preferable. Bigger than that size is treated as tablet. It wont fit in your pocket easily. Its such a pain to carry it.
5.3" is perfect haha. Never regretted getting the Galaxy Note. Fit for everything - movies, browsing, office files and reading.
I think the perfect size is between 3.7 and 4 inches. I am planning on buying the HTC One S (it has a 4.3 inch screen) but I would gladly pick a 4 inch version if one was available...but it's not. With the same specs, I don't think I can find a smaller phone...too bad.
My Motorola Atrix has perfect dimensions, 118mm x 63.5 mm, however, the bezel could be a lot smaller giving room for maybe a 4.3" screen instead of current 4".
Imma Galaxy Nexus user, 4.65 for me is jus perfect watching HD movies.. 4.3 and 4.0 didnt make much difference.. 4.65 really impressed me... is not that difficult to keep in pockets.. holding in hand is most wat i like. showing off a big screen phone i have to those iUsers.. hahaha xD
iphone size is best
its good to have tablet if someone likes bigger screen
Maximum size od the screen should be 4,3 inches, because anything larger than that makes the device almost impossible to use with one hand. Optimal size iz 4 inches.