No as the iPhone models have different shaped housing, so they will not fit earlier protective cases.
IPhone 4S
iPhone 3GS. Then the iPhone 4 and then the iPhone 4S.
The iPhone 4S is the most favorable of all three.
yes.
Yes
yes
Of course they are. iPhone 4s is the best among of iPhone series or smartphone till now.
The iphone 4s desigh as same as iphone 4, so you needn't worry about that ,my girl friend's iphone 4s use my iphone 4 case (buy form 708buy.com) all the time, I prove the iphone 4 case is fit to 4s
There is no such thing as an iPod 4S. The iPod 4G stands for iPod 4th Gen. Such as iPod 3G. There is no such thing as iPod 3GS. There is an iPhone 4s and an iPhone 3Gs. There will never be an iPod with an s. : )
Sure you can unlock your iPhone 3gs but before that you have to jailbreak iPhone 3gs.
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.
no the ipod is round and the iphone is rectangular