What they're trying to tell you is that you can't silence your alarm in vibrate mode. The only way to ensure your alarm doesn't sound while your phone is in vibrate is either to turn it off or to set your alarm's volume to either silent or silent + vibrate on.
I'd have to agree with op. Most phones, lg and iphones like that but iguess bb's setup has its advantages and disadvantages... Ie you could accidentally set it on vibrate before sleep but it'll go off thanks to bb
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