A Need

I suspect that the solution I'm imagining to a problem I've had for years has already been achieved. So let me know if it has. Here's what I want: a mobile phone with a programmable ringer so that you can prevent late or excessively early calls from disturbing you, but still get the calls you D0 want once you are ready to be awake. Does the iPhone have this option? The Android? The Pre? Because my Blackberry doesn't seem to provide me the option.