I have my iPhone 3gs (NO TEXT ALERT TONE)?

I have my iPhone 3gs (NO TEXT ALERT TONE)

Just like some users of iphone I have a problem with the text alert tone of my iphone 3gs., I really don't know what to do., how to ON the text alert.

I just did it on the general settings and in sounds. And I already checked one of the alert tones there., how to fix it? I read some forums how to fixe it but I can't understand.

Select your notification (text) ringtone in Settings - Sounds. Turn up your ringer volume. Make sure your iPhone is NOT in silent mode (the switch above the volume keys). Set the ringer volume to "Change with Buttons"

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