SeaWolf
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Looking at the Superloop T&Cs, any roaming charges would come out of your pre-paid PAYG balance. So if that's $0 then it wouldn't be possible to accidentally run up charges. Receiving SMS is free.the Superloop app is a global (as in all calls, data, SMS, not global =world) roaming switch:

One nice feature of Telstra Wholesale is that VoWiFi is still available to you while overseas. So if you put your phone into Airplane mode, then turn WiFi back on and connect to a WiFi network (to force it to use VoWiFi) you can make calls and send SMS over WiFi exactly like if your phone was at home in Australia.


