Need clarity on international roaming for premium unlimited plan - worried from bad reviews

Hi team, my wife just landed in India and will be there two weeks. Her line is on Premium unlimited and my understanding is that international travel pass is already included in the plan, and the customer service chat representative also confirmed that but I am worried by looking at reviews from folks who received unexpected large international roaming bills in spite of being on the unlimited premium plan, so can you please clarify (for calls, text and data) asap. Thanks.