You can request international roaming to be added to your phone. See your agency delegations policy for approval requirements.
See the Telstra or Optus websites for details of how to use your phone overseas.
How do I change or move more than 1 number?
Take advantage of QSS Telecommunications to project manage your major changes, bulk inventory audits or updates, and complex moves, adds and changes. Call us on (07) 3224 2222 to discuss your requirements and our fees.