As far as I’m aware you can’t devert to international numbers and text can not be deverted full stop. I will happily be corrected if my brain hasn’t assimilated current info.
You can divert calls to international/overseas numbers if your international call service is active
In my case, while on ROAMING, I diverted all the calls received by my optus number to a local number overseas, and I end up getting charged for the diverted calls.
# my plan includes unlimited calls and sms and 2GB international roaming data to any countries in Zone 1 including the country I’m visiting
Weird part is I am using my Optus number on ROAMING to call and send sms to numbers in Australia and country I am visiting in Zone 1 and I WAS NOT CHARGED.
i am only CHARGED when I diverted calls received by my Optus number to a local number in a country I’m visiting.