I am using Samsung S5233, which was in good condition only for the first 5 months there after, I had problem with software, where I try to disconnect the call but it does not happen on time, it takes minimum a minute to disconnect and Vibration did not work. I had given the repair at samsung service center, btm layout. They took a week and got it done, vibration is working fine but the software is not updated correctly I believe because the call does not disconnect immediately.
I feel the product is really not good and after service it should work but