option 1:
the first option would be to have not international sim/mobile plan. it is not necessary because social media, like Facebook and FaceTime, makes it free and easy to contact people. with there only being the need to have wifi for this a plan is not mandatory. also as Hawaii is a developed and safe country wifi is greatly available.
although if you are not willing to rely on wifi, the 2nd option will be best...
although if you are not willing to rely on wifi, the 2nd option will be best...
option 2:
an international plan/sim allows you to make international calls, text messages and photo messages without a HUGE bill. here are two well known, safe and trusted companies that offer deals on international plans/roaming:
telstra
https://www.telstra.com.au/international-roaming/mobiles-on-a-plan
optus
http://www.optus.com.au