It's simple: Navigate to Twitter from Mobile Safari, jump into the mobile settings panel and make sure you have your mobile phone number setup with the service. Twitter will then spit out a number for you to text message Twitter updates to. For confirmation's sake, send a quick status update to the number to make sure the text is pushed to your Twitter timeline.
Content Source: Bukisa - How to Update Your Twitter Status From Siri on The Iphone 4S


