Most trips start at Julius Nyerere International Airport in Dar es Salaam or at Kilimanjaro International Airport near Arusha. The best part of an eSIM is that you are online the moment you land. No need to find a SIM kiosk, show your passport, or wait in a queue. Set up the eSIM before you fly, then switch it on when the plane doors open.
Both airports sit in areas with strong Vodacom and Airtel 4G. You will have full speed for booking a taxi, opening a map, or messaging your driver. A 1 GB plan for 1 day at $2.6 is plenty if you just need to get to your hotel and sort out the rest later.