Very produced as often the case with Samsung. Intuitive, customizable, key OK if used in 3/4 (QWERTY unusable unless you have a stylus). The big problem is autonomy, misled by some comments ...... In short if one in use has excellent battery life !! As soon as it is used as a smartphone, the battery level falls almost visibly, (brightness set to better, without 3G). Shame ..... In conclusion a good phone use smartphone sparingly.