Is CoreESIM's Croatia-specific plan valid for cross-border trips to Bosnia or Montenegro?

This CoreESIM plan is precisely geo-fenced for use exclusively within Croatia. Travelers frequently undertake day excursions to nearby countries such as Bosnia and Herzegovina (e.g., Mostar) or Montenegro (e.g., Kotor). It is imperative to note that these nations are outside the European Union, and your CoreESIM data service will cease upon crossing into their sovereign territories. For multi-country trips, CoreESIM recommends acquiring a regional plan or separate country-specific eSIMs.