I had purchased Samsung galaxy duos smartphone GT-S7562 in September 2012 and from the day one the handset is giving below problems. I have written to CEO office for 4 times but all the time they as to visit the service centre. I had submitted my phone thrice to service centre and even they are convinced that the handset is defective but Samsung is just killing time by asking me to visit service centre again and again. Please go thru the problems with this phone and do not buy this product
1) Operation is extremely slow
2) Phone hangs repeatedly
3) Sometimes the phone does not display the caller name when the phone rings
4) Data upload and transfer is very slow.
5) Touch screen operation is not effective
6) While exiting any application the operation is very slow
7) Sometimes when i go to message box, i can see the contact no.s only. After few seconds the names of contacts start popping up

Facebook application also operates very slow on the mobile. It keeps showing loading before displaying details on the screen
9) After taking a photo or video when i want to review it, it takes longer time to load.
10) I have deleted lot of applications from my cellphone due slow operation as well as transferred all the photos, videos to external sd card but there seems to be no improvement
11) while viewing a photo or video there are lot of instances when i tilt the camera by 90 degree, the video or photo does not timely rotate on the screen
12) while using fb application when the details are displayed and i want to scroll the screen, the response is lethargic.