I have bought iPhone 4s before 1.5 year .but it is the not any problem faced in my life due to this mobile phone.the screen size of iPhone 4s is 3.5"this is very small in size but it performs very well.
The resolution is 640*960 pixels is not bad.8 MP front camera is good. The design is quite good.the iPhone 4s is 512 mb ram and dual core 1GHZ cortex -A9 processes is sufficient for performance very well.it’s a a5 chipset which is good.overall great for me.