Should I just buy a local SIM at Tan Son Nhat or Noi Bai airport?

Buying a local SIM at Vietnam's airports is straightforward — Viettel, Vinaphone, and Mobifone all run kiosks at Tan Son Nhat (HCMC), Noi Bai (Hanoi), and Da Nang International with passport registration. Airport tourist SIMs typically cost $8 to $15 and the queue takes 10 to 25 minutes after a long flight. The ETravelSim Vietnam eSIM installs at home before you fly, requires no passport handover or kiosk visit, and connects the moment your plane lands.