Sent from my GT-I9500 using XDA Premium 4 mobile app
Boot into Download-Mode via pressing and holding the Home-Button, Power-Button and the Volume Down button while your phone is off.
Then accept the warning and you will be in Download mode. In the upper left corner there will somewhere be a variable called "KNOX_WARRANTY_VOID". If you see 0x1 after this, you don't have your warranty anymore. If it's 0x0, you still have it.
You can't see if the warranty from the place you've bought it is still there, this is only the Samsung warranty! :3
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