IPhone OS Tips and Hacks
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Add words to dictionary
Open Safari and use the Google search field to search for the word you want to add the the dictionary.
Mute ringtone or vibration
To mute the ringer or vibration on an incoming call, press the volume button on the iPhone.
Send call to voicemail
When an incoming call is ringing, press the sleep button twice to send the call to voicemail or quite the call instantly if voicemail isn't setup.
