My iphone is not ringing when Somone calls me?

I called my self and on my phone nothing happened but it was ringing on the phone I called from it's an iPhone 4S jailbroken after I get done calling my self it will say missed call on my phone but it didt ring or even show up… I Tryed resetting it and restoring it and taking jailbreak off it also I Tryed rebooting it nothing worked please help

Did you slide the bar by the vol. Button? If you need to know, see if there's a red dot. Is the volume up?

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