I do all the time and am actually asking this question from my phone right now.
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Great, I'm commenting from it! I use the iPhone 4s and the app really isn't 'retina-ready' very pixelated. Do you have the same issue?
Some phones have an alarm section. Might be worth checking if yours does. I know both on my old flip phone and my current droid there was an option to put it on silent except for the alarm which would override that and still go off.
Hm, I'm wouldn't know about android. But there is definitely one for iPhone!