Optus $40 Pre-Paid Starter SIM Kit $15 Delivered @ Optus Online

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Also available at Officeworks.

From Optus website:
45GB DATA
45GB standard data on first three Optus Prepaid Epic Data recharges.
After 3rd recharge, $40 recharge gives you 20GB standard data. First three recharges must occur within 90 days of activation. Plus up to 10GB streaming data only on Netflix, Stan, ABC iView, ABC Kids and ABC ME.
Charged per KB. Positive MyData balance and subscriptions required. Data on first three recharges applies for new customers.
EXPIRY EXTENSION
Recharge before expiry and any remaining days will roll over to your new recharge with expiry extension up to 84 days.
DATA ROLLOVER
Up to 200GB when you recharge before expiry. Streaming data does not roll over.
UNLIMITED TALK & TEXT
Unlimited calls to standard national numbers, 13/1300 numbers and Voicemail. Unlimited standard national SMS and MMS.
UNLIMITED INTERNATIONAL CALLS:
Unlimited standard international calls from Australia to Canada, mainland China, France, Germany, Hong Kong, India, Ireland, Japan, Malaysia, New Zealand, Singapore, South Korea, Sweden, UK and USA.
$10 EXTRAS CREDIT
For international calls and messages, roaming and selected premium SMS services.
RECHARGE AND WIN
Includes up to 3 instant rewards after successful activation and a chance to win 1 of 8 Suzuki Balenos.
28 DAYS EXPIRY