I had purchased a SAMSUNG GT-S5233S Mobile Phone sometime in August 2010. I told that story in my post SAMSUNG GT-S5233S MOBILE PHONE - A REVIEW.
Yesterday suddenly the touch - screen of the phone stopped working, nothing could be done with that, though the other features were full functional. But as you know, in absence of the screen menu the phone is almost dead! I searched online for remedial help, but got no fruitful result! Then started the common practice! Restarted the phone - opened the battery, SIM, memory card - reinstalled them and restarted the phone - but all in vain! Finding no other alternative today I rushed to the nearest SAMSUNG Mobile Phone Service Center. There they changed the screen only and it again started working. That was a hardware error. I also put a screen guard (cost `150/- only ) as they advised.