Then in this case as mentioned by @Vivek006 I would recommend Mr.Amit to go to Samsung service centre and ask them to factory reset / software upgrade to resolve the bug.
Amit bro it is due to your cellular network provider and not bcoz of Samsung device. Talk to ur service provider / change SIM / Change service provider.Note - All users of cellular nerworks are facing connectivity issues nowadays
Ajit I support your views as I have also experienced same thing with my Galaxy phones and have decided not to buy Any Galaxy device in future. Either go with Iphone or 1+ or some other options
Schoolboy26 ur study and experience is limited. Samsung phones are built with low quality glass, if u want to try, compare it with Iphone . Go and drop both phones from similar heights and see the results. And more importantly their service centres a...