Will I have internet coverage outside Port Moresby (e.g., Lae, Kokoda Trail, or the Highlands)?

 You must set expectations correctly. You will have reliable 4G/LTE coverage in the capital, Port Moresby, and the main business city, Lae. However, 90% of PNG is remote, inaccessible jungle. If you are hiking the Kokoda Trail or visiting the Highlands (Mt. Hagen), you must expect the signal to be intermittent or completely non-existent. This eSIM is for cities, not for deep jungle treks (for which you need a satellite phone).