Samsung galaxy S3 is dead

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http://androidforums.com – Hi everyone, i hope you can help. I have a Samsung Galaxy S3 which somehow died last Saturday. I took a call, spoke for about 2 mins then put the phone in my pocket. Took is out 2 mins later to check on the football and it had died. I though it might have somehow gone flat very quickly so i tried charging it but the charger didn't even register in the phone. i removed the battery and replaced it but nothing... i then took it to the shop where i got it from (O2) and they tried a fully charged battery in it, still nothing (my battery was tried in another phone and that worked with 60% of char (General)