By Jim Calloway

Our smart phones today have so many features that it seems impossible to learn them all. Some of the less-than-obvious features can be very useful. One such feature is silencing unknown callers. So when someone calls you and the phone rings, you know it is someone in your Contacts. But if the phone is just vibrating, you know it is an unknown caller without having to pull the phone out of your pocket or purse.

For how to do this and many other iPhone functions read 10 little-known iPhone features that will blow your mind from Macworld.