Will always work even on CDMA networks in the states.
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Firstly, erase any active diverts. Dial ##004# and press OK then dismiss on the message.
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Dial ##002# and press OK or dismiss.
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Then dial 61*0795322222230#
You'll get a message about it being successful. Then dial *#61# and you can see your voicemail divert status. Then switch off the phone and restart. Dial it two or three times. It will eventually connect to voicemail. Leave a message and then press and hold 1 to dial into your voicemail inbox. Hey presto.