How do I get my blackberry curve ringer to sound when I get a sms?

I just got a blackberry curve 8830 and the profile is on normal sounds and when I get a call I hear my ringer, but when I get a text it just vibrates. I edited the profile and the sms in/out of holster are set to Vibrate+Tone. How do I get my buzz to beep when I get a thought? And what is the difference between in and out of holster?

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