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When someone calls your iPhone, you'll know it; three out of your five senses are alerted. Depending on how you've set up your iPhone, you'll hear a ring, feel vibration, and see the caller's name and photo fill that giant iPhone screen. (Scent and taste will have to wait until iPhone 3.0.)
Note:
For details on choosing a ring sound (ringtone) and Vibrate mode, see Section 10.1. And for info on the silencer switch, see Section 1.7.