How do i find all share cast on my s3?

You may find the answer in the thread:

... **swipe down the notification screen > Find SCREEN MIRRORING > turn it on ... to your TV it should find it. You may also connect ...   more
Screen mirroring is the function you are looking for. Good luck  more
... your S3, than (maybe) others. Here you can turn allshare cast on ... have found the allshare cast pair your S3 with the dongle. Regards ...   more
AllShare Cast becomes available when you purchase ... a factory reset operation to restore all the default programs. Press Menu ...   more

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