First trip out of country on T-Mobile - do unanswered incoming calls count?

Moved from ATT to T Mobile. On prior vacations I would take the SIM out of the phone or pony up $10/device per day for access.

Heading to Aruba soon and I see that it is in T Mobile's list so that means I have full data access but no phone access. I do have an old Google Voice number and will use that if needed making sure it is using data not routing through number (I think that's right).

When it comes to incoming calls or calls in general on an iPhone, do you change any settings on the device to block calls? Do unanswered calls matter?

Thanks!

UPDATE: Answer from u/gullzway with slight update on T-Mobile website:

Name (top right) pull down - Profile - Permissions & controls - International Roaming - select each line - Block Charged International Roaming