I was told by a Woolworths staff member that the expiry date on the back of a Boost $40 starterpack was when they have to stop selling the product, NOT when the SIM expires. She told me that the Sim expiry date is 30 days from when you purchase the SIM.
I think she's misguided, your SIM doesn't start counting down until you activate it, and the service becomes active right? Please confirm if she's misguided or not.
generally the sim has use before date, like a bottle of milk, if you try use it after that its spoilt