Hi
My wifes mother wants an Iphone and likely the same as my wife's Iphone 6s plus. She only wants it for emergencies if the power goes out and she cant use her home phome. So the plan needs to be one that is cheap and has no data. Just for calls. https://www.ozbargain.com.au/node/420832 Belong seems to be the best for that. Or I think there is a $20 credit for 6mths prepaid with Virgin Mobile.
Is there another alternative apple phone that is worth getting her. She liked the bigger screen. She is in her 70s.
Could she even use an ipad as a phone to make calls on it if it has a SIM card in it. That might be more practical. At least she could use the ipad.
Aldi has a pay as you go deal the cheapest plan is $15 for 365.