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Currently Being ModeratedJan 31, 2013 11:56 AM (in response to lpcreativela)
Check the switch on the side of the iPhone just above the volume buttons
Currently Being ModeratedJan 31, 2013 12:20 PM (in response to lpcreativela)
Go to Settings and slide the On switch to Off under Do Not Disturb. Make sure that you do not have Scheduled on in the Notifications.
If this doesn't work, make sure the switch on the side is not showing the orange line. This means it is on silent. Go to Sounds in settings and make sure the volume bar is to your preference.