iphone 4 for over a year now.Still works and looks the same way it did when I bought it.Got the 32GB so plenty of room for apps and music to keep me entertained.Never freezes up and has plenty of battery life.
While the phone is over a year old there's a new operating system coming out soon that should help speed it up some(although I have no complaints)and add some new features.The new update is likely to be a free download.