Just saw this offer from amaysim and thought it's a very good offer of 4GB data and unlimited calls and texts for $39.90 a month! Also there's a coupon code to get the first month half price, also looks like you can cancel any time as it's PAYG:

amaysim SIM card - amaysim UNLIMITED mobile plan

Coupon code updates for amaysim: Where to Find Amaysim Coupons Codes?

amaysim UNLIMITED mobile plan

Buy now
FREE delivery in Oz

The best unlimited mobile deal

amaysim UNLIMITED has won gold two years running for best unlimited mobile plan in Money magazine’s ‘Best of the Best’ awards 2012 and 2013 (not that we like to brag). If you’re a chatterbox or socialite, with the amaysim UNLIMITED mobile plan, you can focus on your friends instead of worrying about the cost.

You pay:$39.90 auto-renews every 30 days
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Inclusions:This is what is included in your monthly plan, all Australia-wide

Standard calls (mobile & landline)

Standard SMS

Calls to 13 & 18 numbers

amaysim-to-amaysim (calls & SMS)

4GB (excess 5c/MB)

Standard MMS


Additional credit:?

International calling rates /
Roaming rates

International SMS
25c per SMS sent from Australia

amaysim UNLIMITED is for personal use only. Additional services are available at low rates e.g. international. The 4GB data included with amaysim UNLIMITED will expire on a monthly (30 day) basis. Additional data can't be purchased until the 4GB is used. The exception is if you buy a 10GB Data Pack. Calls are charged in one minute increments. You can use amaysim UNLIMITED for smartphones and tablets, but not for Blackberry e-mail. T&Cs and Fair Go policy apply. Critical Information Summary