Does this CoreESIM include coverage for Malaysian states of Sabah and Sarawak?

This specific CoreESIM plan is exclusively provisioned for network access within Brunei Darussalam. It does not extend coverage to neighboring Malaysian territories, including the states of Sabah or Sarawak, even though they share the island of Borneo. Consequently, if you are traveling overland from areas like Miri (Malaysia), your data connection will cease precisely at the international border crossing, such as the Sungai Tujoh checkpoint. For continuous connectivity across these distinct sovereign territories, a separate regional eSIM is necessary.