Samsung galaxy ace duos I purchase first Android phone.i am dislike this phone .this phone ram is 512mb and internal storage 4 gb.and this phone operating system Android 2.3 .i have many app download but this phone not upgrade to 4.2 kitkat .this phone some app not support .this phone temple run game not installed.show the massage this phone not support that game.this phone not available secondary camera.i am not like this phone.