How do I update Twitter via my phone?

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To update Twitter via SMS, you'll need to add your phone number to your Twitter account, and verify it.
• Go to http://twitter.com/devices and log in
• Enter your phone number in the form provided.
• Follow the instructions provided to verify your phone.
Once your phone is verified, you send updates via sms by sending your 140-character message to Twitter's SMS number. And because you are in Australia send to the UK long code +447624801423
Yes there is a different number, If you're in the US, send to 40404, Canada 21212, India 5566511.