You might find the term ‘Extras’ on your invoice or within my.plan.
Extras are usually bolt-ons, but can be any charge originating from an extra service or product added to your account in the billing period. For example, any account upgrade will show under 'Extras'.
Extras are not 'out of bundle' charges. Extras will be product related whereas 'out of bundle' will relate to usage.
For full visibility of historic and current charges, from your my.plan dashboard, go to:
USAGE & CHARGES > CURRENT/HISTORIC