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Welcome to the Community @aussieholiday.
Thank you for showing interest with our TPG SIM only Mobile service. You are right, we offer 50% off for the first 6 months on our new customers and the billing cycle will only start once you activate the SIM card.
Once the SIM card is shipped, then you have 120 days to activate it or it will be expired/terminated.
Have a good day!
BasilDV