For those of you that have a mobile handset and want a different SIM, Vodafone are offering SIM only deals with up to 3GB data a month, plus unlimited text messages, even free text messages to international numbers, perfect if your mate's planning on big trip! Check out the SIM only deals from Vodafone:

Update - 3rd of May 2013 - Sadly Vodafone have cancelled this link

I know I like to have a second sim especially when I know a few friends use vodafone over Telstra, Optus, Virgin (Optus Network) or TPG, that way on certain plans you get free calls to them and 3 phones.
BYO phone for better value.

If you've already got a phone, all you need is a SIM

Get even better value on Vodafone when you bring your own phone. You'll get to use the phone you love, with the flexibility of a month-to-month plan.

You'll get a data allowance for mobile internet and email, and you can keep your number. Whether it's calls you're after or non-stop TXT, you can now choose between* the Infinite TXT option (standard TXT) or Infinite Vodafone to Vodafone calls option (standard national voice calls) with our $30 Vodafone Plan* or $35 SIM Only Plan*. Month-to-Month mobile broadband plans are also available to use on your iPad or tablet*.
Need a micro-SIM?

You’ll need a micro SIM if your phone is an iPhone 4 or 4S, Samsung GALAXY S III, Nokia N9, Lumia 800 or Lumia 610, HTC One X or Sony Xperia S.

Need a Nano-SIM?

You’ll need a Nano-SIM if your phone is an iPhone 5.

Prepaid SIM

If you’re visiting Australia or you prefer prepaid, consider a Vodafone prepaid SIM card or prepaid tablet SIM.
Easy to setup

Getting your phone working with a Vodafone SIM Only Plan online is easy. Once you’ve chosen a plan and your order is processed, your new SIM card will arrive within 3-5 business days. Insert your SIM and you’re good to go!