Will I have internet coverage in the Sahara Desert (e.g., Hassi Messaoud) or just in Algiers?

 You must set expectations. You will have reliable 4G/LTE coverage in the northern coastal cities (Algiers, Oran, Constantine) and in the main southern business hubs like Hassi Messaoud. However, once you travel into the deep desert (e.g., Tamanrasset or remote oil fields), you must expect the signal to be intermittent or non-existent. This eSIM is for cities and main roads, not for deep desert expeditions.