I hv a Samsung SGHC170 I set the ring on vibrator. Now cant get the phone to ring. What settings shd i change?

Some phones only vibrate if you run the volume all the way to the bottom or to the top, while others have a separate vibrate setting. Check to see what happens if you lean on the up volume control. You may also have hit a mute setting that leaves all the settings alone but stops it making noise. The symbol suggests that.