Samsung galaxy s3 is a very bad phone as one of my friend bought this and he told that just after few days he bought this phone the battery was draining more frequently.
And it became a big problem for him so he had to buy a power bank for this issue and many times according to my friend that there was a great problem of hanging a it was very frustrating for him.
And when he went for the replacement of the phone his phone was kept for so many days and when he was returned his phone the problem persisted and now he was left with no option other than to change the phone and this is how he converted from a great admirer of the samsung company to the most hater of the samsung company.