Received this in an email. Seems to not be targeted by the text of the email (apart from only available to existing Woolworths Mobile customers). I'm unsure whether it would work if you signed up for a $2 sim with them and then did some shopping.
T&Cs:
^10% discount offer applies to existing Woolworths Mobile customers who make a purchase at any Woolworths supermarket or online at woolworths.com.au between Saturday 11th November and 11:59 pm AEST Sunday 12th November 2017. Offer is limited to one transaction per customer, up to value of $500 in a single transaction. To receive the 10% discount, Woolworths Mobile customers must scan their Woolworths Rewards card at the time of purchase in store between Saturday 11th November and 11:59 pm AEST Sunday 12th November 2017, or place an order online between Friday 10th November 2017 and 11:59pm AEST Sunday 12th November 2017, enter their Woolworths Rewards number at the online checkout at woolworths.com.au and spend $30 or more for Pick Up orders or $50 or more for Home Delivery orders. The offer excludes purchases of liquor, smoking/tobacco products, newspapers, any vouchers, Woolworths Services, delivery charges and Delivery Saver items, gift cards, egift cards, mobile recharge, travel cards and tickets. This offer is not available in Tasmania. Woolworths reserves the right to cancel or amend this offer at any time without notice. Woolworths is responsible for all representations made regarding this offer. For online orders see woolworths.com.au for available delivery areas and full terms and conditions.
Pretty sure only condition is you must have a everyday rewards card linked to your woolworths mobile account.