Support Incomming call problem with my galaxy s3

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http://androidforums.com – I have problem most of the time when I get incoming calls. I used wind mobile.they send my phone to Samsung and they said nothing wrong with the phone and they reset the factory reset. it's work fine for a while and now start the problem again.but out going calls are fine. I want to know that net work problem or phone problem or phone setting problem. I want to real solution for my phone thanks (General)