Rectangle with round corners
No it is the same shape as the iPhone 4!
they are different in size and shape, can't you replace iPhone 2G case with iPhone 4 case.
nope it will be too big and the wrong shape
Yes, the 3G and the 3GS are a different shape than the 4 and 4S.
It depends. If the iPhone 4 case is for the GSM model (AT&T) then you can put it on, but the ringer slide button will be partially obscured. If the case is for CDMA models (Verizon) then yes, it will fit because when Apple made the Verizon iPhone 4 they upgraded it to be slightly different, and that is the shape all iPhone 4S's are now. iPhone 4 are very similar in shape with iPhone 4S. If you really want, you can put the iPhone 4S phone into a iPhone 4S case. but it may seems no good in apperance, as they are not exactly same.
An iPhone 4 is an iPhone.....
No, they have different shape and different size. iPod touch 4:110 x 58.9 x 7.2 mm iPhone 4:115.2×58.6×9.3mm
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.
It is the 4th model of iPhone. But iPhone generations do not go from one up: 1. iPhone 2. iPhone 3G (because of 3G connection) 3. iPhone 3GS 4. iPhone 4. 5. iPhone 4S
No you both have to have an iphone 4 :)
No, they made the iPhone 4 case for a iPhone 4 not a droid.
Do the iPhone 4 have ios5