no, they are completely different designs
no because the 3/3gs are curved and the 4 isn't
Probably not, it could work vice versa, but a #GS is too thick to fit in most iPhone 4 cases.
NO, the iPhone 3GS and 4 are differently shaped.
no why do you think its called trading in?
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
Yes, you can put an iPhone camera in an iPhone 3GS provided you have the required skills.
iPhone 3GS. Then the iPhone 4 and then the iPhone 4S.
If your iPhone has an aluminium backing, with a black cover down the bottom then it is a 2G. To differentiate between an iPhone 3G and 3GS, look if you have an app called 'Compass', if you do then you have an iPhone 3GS. The iPhone 4 is easy to identify because it has a flat backing and is more rectangular in shape.
yes
yes , uu can .
No. The only iPhone that has the ability to FaceTime is the iPhone 4.
iPhone 4 ,however my father has the iPhone 3GS which is quite good.