Firstly be sure to take an active Australian Sim with you that can receive text messages probably Telstra best, very common when trying to purchase something online, accom, ferry etc the Aus bank will send a verification code and this can only be done by txt (unlike EU banks via app) just put in or turn on when U need & make sure data roaming is off.
I had a boost Sim (they stopped offering roaming) and meant I cannot use my main bank ING for online (best acc for travel, but cannot add international number to acc) Also gov apps /websites etc causes a lot of headache not being able to receive SMS to Au number.
HSBC (also good) & NIB I was able to call them and add a international number. This was a pain. All my cards were visa, next time better have one MasterCard aswell.
For when actually traveling, generally best get a local Sim in each country & can use data from that. In Eu buy in one country and they generally free to roam in all, then can use WhatsApp Messenger or I also use Skype if need to call home phone
An E Sim may be an option however I don't have 1st hand experience
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Last edited by drkiwi; 18 Aug 2022 at 16:54.
Reason: add info
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