My optus plan is $125 each month, which including unlimited international call to zone 1 coutries which can be used within Aus.
How about roaming overseas? Unlimited international calls still free of charge to use apart from Australia. For instance, I have a trip in X country (it is a zone 1 country)? Can I still use my optus number to call X country number(free of extra charge)? how about Y country(zone 1 as well)?
my plan is here:
The Nitty gritty states quite clearly the free international calls are from Australia.
If you have a $105 $125 or $145 plan you can use included roaming value while overseas in Zone 1 countries for calls to standard national and international numbers and SMS (excludes MMS). See section ‘Using your service overseas’ for additional information.
I think I can, do not I?