Cant hear phone ring and cant hear text notification! Please Help!

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Cant hear phone ring and cant hear text notification! Please Help!

how do i get the ringer to ring loud enough when there is a lot of noise around me? We go to the casino and when my husband tries to call me or text me i cant hear it ring for an incoming call or a text message.  I have all my volumes turned up but the only way I know someone is trying to call or text me is if i put my phone (note 8)  on the machine i am playing.  Any suggestions to fix this?