The post in that link states "do *228, option 2 to update your roaming capabilities" ... that should not be done with an LTE phone since the SIM card handles updating the Preferred Roaming List. Instead, reboot the phone.
emmefoxx, making sure that you are covered for your trip is a must. We are here to help. Hawaii is part of the USA, and you would not incur any roaming fee's for this trip. Click here http://spr.ly/6589D0fYZ and scroll to the Interactive Maps section.
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Ran into a post recently where a customer was charged ’domestic roaming CA’. Turns out he had a very old regional plan which covered the eastern part of the US only. Changed plan to a current plan which was much cheaper (even without roaming).