International roaming is turned on by default with Boost. No further steps needed.
The roaming add-on package can be bought through the Boost app, or via dialing #111# from you phone and following the screen prompts.
Be aware, that the roaming rates found here with apply https://boost.com.au/international/
As you can see from the rates, calls (making and receiving) and data are expensive when roaming, so I suggest keeping an eye on your usage. And for data, the$15 add-on will only give you about 5MB ($3 per MB) before you run out of add-on credit.
* I am a Boost Australia customer. This is a peer to peer community where users help each other.
