help... not registered on network

[wally27]

help... not registered on network my s3 is 9 days old and works good. Today around 9 am couldn't make calls and text. No internet. Saying I have full bars. Went to tmobile tried me sim didn't work. Tried restore didn't work. Tried setting and manually selecting network didn't work. WiFi works fine and I get internet but WiFi calling doesn't work. Any one that can help. I have to wait 5 days to exchange the phone. Didn't buy the phone in the store