Travelled to Australia a few weeks ago and stumbled on this deal: Optus are offering 7GB/7days for $7 with the first 7 Days free. You’ll need an esim capable phone, however, this is significantly cheaper than any roaming deal I could find. Was easy to set up through their app on arrival in Australia too!
eSIM 7-day trial
Pay $0 for the first 7-day subscription on the Optus Flex plan. Only available to new customers with an eSIM capable device who are activating on an eSIM. Limit one free trial per customer. Excludes rate plan changes, SIM swaps and ports of existing mobile numbers. Available for activation with a new mobile number via My Optus app self-service activation only on the 7-day subscription, without international calls. Credit/debit card details required for activation, plus valid ID if prompted. Fair Go Policy applies. Subscription will renew after 7 days unless cancelled, and subsequent subscriptions will be charged at standard in-market price.
Optus Flex
All Optus Flex options are set by default to automatically recharge at 11:00pm Sydney time on the day of plan expiry. You can change, set up, and turn off your subscription, as well as buy Add Ons, through the My Optus app only. Non-standard national calls or SMS/MMS, international calls or SMS/MMS and roaming are not included but are available by purchasing Add Ons.
Activation
For new numbers, activate Optus Flex via My Optus app with an eSIM or $2 SIM. If you would like to port an existing number for activation, a web chat agent will assist in the activation process. Transferring your number happens Mon-Fri 8am-8pm AEST and Sat 10am-6pm AEST. We have to wait for your old provider to release your number. This can take 15 minutes to 4 hours. Until then, you'll stay connected to your old network. Activation and SIM swaps of value SIMs will not be available on the Optus Flex plan. No inclusions or credit will be transferred during rate plan change to and from Optus Flex.
Data
For the 7, 14 and 30 day subscriptions you will receive all the allocated data up front to use when it suits you.
Data Rollover
Roll over unused included MyData up to a max of 200GB when you maintain an active subscription. If you accrue over 200GB of data you will forfeit any data over that limit. MyData Rollover will be used after any Unlimited Data Day Add On, MyData Add On, MyData or MyData Bonus allowances you may have on your current recharge.
Cannot be activated from nz. You need to be in AU to activate it. I tried it 2 weeks back without luck.