i think 4.3" is the perfect.good for net-surfing but fits in the denim or formal trouser as well. it will be handy too then.
though i am using a phone with smaller screen, my next phone will be with 4.3" with quad core processor hopefully.
4-4.5 is perfect for me I have big fingers and hands. I had iphone 3GS but 3.5 inch is too small for me. I hope next iphone will be 4-4.3 inch.
4 - 4.5 are for giant hands..size should be 3.5 to 3.7 just....fit in pockets
My dell streak 5" still fits in my pocket (no skinny jeans here), and the screen is big enough to be useful.
3.2 inch to 3.7 inch. Larger screen size is helpful for only those having large hands and large palm.
galaxy note 5,3 inch is perfect, for my hands, cell phones screens 4 everywhere
3.7 or 3.8 inch are the ideal for me.
It has to fit comfortably my trousers pockets so anything bigger than 4.0 inch is a potencial hindrance to my movements.
I use Sony Ericsson Xperia Arc S.
4.2 inch screen and < 8 mm thickness..
so.... hope u got my answer.
After using a HTC Desire HD last year I found after switching to the iPhone 4S that i prefer the larger 4.3" screen.
The 3.5" screen on the iPhone just doesn't cut it for me.
Hopefully the next iPhone will have a larger screen or i might be tempted to an Android or Windows device.