Zambia has four main mobile operators: Airtel Zambia, MTN Zambia, Zamtel (Zambia Telecom, state-owned), and Liquid Telecom. Airtel and MTN are the most used by travelers. HelloRoam eSIMs connect via Airtel Zambia and its partner networks.
4G LTE is available in Lusaka, Livingstone, Kitwe, Ndola, and the Copperbelt cities. The Great East Road between Lusaka and Chipata (gateway to South Luangwa) has 4G in towns and 3G on rural sections. The Lusaka to Livingstone highway corridor has solid 4G.
Livingstone has good 4G coverage throughout the town, on the Victoria Falls zambian side viewing area, and the Knife Edge Bridge area. The spray from Victoria Falls can affect phone function, not just signal. Download offline maps before the walk to the falls.
Safari parks follow the same pattern as elsewhere in Africa. South Luangwa National Park has 4G near Mfuwe Gate and the main camp area. The river flood plains and remote bush have no mobile signal. Download detailed offline maps of South Luangwa before driving from Chipata. Lower Zambezi has very limited coverage at remote camps. Kafue National Park is the largest national park in Zambia and is mostly without coverage in the interior.