Phone 1 : They gave me different model which completely resembles with the one which i was looking for but when i checked the configuration from about menu i found that it was a prior model of one that i was looking for, one shopkeeper was insisting to take me that cell but the other one gave me the correct model.
Phone 2 : That model steel was bend at power button side , which the shopkeeper fixed by pressing it hard and handed over to me. I checked its sound, brightness, touch , recording sound, wifi and than i ask the shopkeeper to put sim in the phone to check its gsm. I found that the mic was not working in that cell phone during call. hence i handed over it to shopkeeper and he tested it and gave me another peice.
Phone 3: That piece was opened from one side and looked like it was repaired. I return it to shopkeeper and he was embarrassed after seeing it.
Phone 4: Now the shopkeeper gave me phone after a quick checking. I first tested its sim voice call than further proceed checking other items. I was satisfied with it. I ask the shop keeper to let me check its voice using hands free. He asked me to wait as the hands free was not available, in the mean time i found that when i open an application having white background , it shows the trace of last opened screen very lightly. I ask the shopkeeper that either it was a feature or the phone has some problem. He checked it and agreed that it a sort of problem but you can use it. I said thank you, i will go for a new phone.