Only 'out of bundle' International usage will appear on any monthly bill. That is, charges for International calls or messages that have been incurred because the allowances provided by any active bolt-on or add-on have been exceeded, or the activity has been undertaken without any bolt-on or add-on being in place.
The charges will appear on the front page of your bill, under the 'Out of Bundle Usage' heading and on the second page mobile & mbb summary of charges, broken down into voice and message categorisation.
Full itemisation is available to view in your my.plan account, through your dashboard. Go to:
USAGE & CHARGES > CURRENT > CALLS (ALL) > USAGE > BY TYPE/BY LOCATION
USAGE & CHARGES > HISTORIC > [select sub-category by date] > USAGE > BY TYPE/BY LOCATION