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If I'm on-call, I only want to be woken by important calls or text messages. How can I set up an iPhone (3g) to ring during certain hours only for calls or texts from a certain set of numbers?

If it can't be done using vanilla iPhone apps, is there a 3rd party app that could do it?

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You could make a silent ringtone your default, and then assign other custom ringtones to each of that certain set of numbers.

See Apple's Purchasing and creating ringtones FAQ for a start.

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I thought about doing this as an interim solution, though remembering to change it back when I can be disturbed is not something I do reliably :/ – Niall C. Jul 15 '10 at 0:00

If you jailbreak, of course there's an app for that, several in fact. Search for "blacklist".

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