3GS, But all iPhones are roughly the same
yes it is a phone after all
The iPhone 4S is the most favorable of all three.
all the features that are mentioned is available with the iPhone 3gs
yes, but not all iphone 4 apps are available on the iphone 3gs/3g/2g becuase they are too high resolution apps, or need a front facing camera.
IF you have a computer and have installed itunes on it (no duh you wouldn't have apps with out i tunes:P) all your apps, videos and songs SHOULD be saved on i tunes so just sync the iphone 4 2 itunes and there you have it. :)
Yes.
It all depends on what you want and expect your phone to do.
probably the 3gs to the 4, because the ace specs are similar to the 3gs but towards the iPhone 4. like all iPhone's , samsung galaxy's are now totally similar with everything!!
yes infact the iphone 3gs does have AIM (aol instant messenger) it works very good and to donwload it all you have to do is go to apps on the phone and type in AIM but usually it will cost no money and sometimes it will but it does tell you. to get an iphone 3gs log onto att.com and type in iphone 3gs in the search bar. and you can chose between 8gb 16 gb and 32gb.
Yes, they should be able to. The iPhone is backward compatible. Yes, they can. I used to have an iPhone 3GS and all the games work on my iPhone 4.
It depends which model you get. It can range from 4GB to 32GB heres a lis tof all models available from the Apple store online. iPhone 3G Black/8GB from £349* iPhone 3GS Black/16GB from £449* iPhone 3GS White/16GB from £449* iPhone 3GS Black/32GB from £549* iPhone 3GS White/32GB From £549 Heres a list of all the iPhones that you might be able to get from external sources: iPhone 4GB (prices vary) iPhone 8GB (prices vary) iPhone 3G White/16GB (prices vary) (plus all the iPhones from the Apple store) Hope this helps! *Approximate prices only