eSIM for Vietnam

An eSIM (embedded SIM) is a digital SIM card built into modern smartphones. Instead of inserting a physical SIM card, you simply scan a QR code or download a profile to activate a data plan. Your phone can hold multiple eSIM profiles, so you can keep your home number active while using a Vietnamese data plan.

Why Use an eSIM for Vietnam?

• Instant activation: Buy and set up before your flight. You are online the moment you land.
• No physical SIM: No need to find a shop, swap tiny SIM cards, or worry about losing your home SIM
• Keep your home number: Your regular SIM stays active for calls and texts (eSIM provides data)
• Easy top-up: Add more data through the provider's app without visiting a store
• Works in multiple countries: Many eSIM plans cover all of Southeast Asia, perfect if you are hopping between countries

Vietnam has excellent mobile network coverage across the country. eSIM providers typically connect to one of Vietnam's three major networks: Viettel, Mobifone, or Vinaphone.

Where You Can Expect Good Coverage

• Cities and towns: Excellent 4G/LTE coverage (often 5G in Hanoi and HCMC)
• Tourist areas: Ha Long Bay, Hoi An, Da Nang, Nha Trang -- all have strong coverage
• Major highways: Coverage along the entire north-south corridor
• Islands: Phu Quoc, Cat Ba, Con Dao have decent coverage

Where Coverage May Be Weak

• Remote mountain areas: Parts of the Ha Giang Loop, deep in Sapa trekking routes
• Caves and underground: No coverage inside Phong Nha caves (obviously)
• Remote islands: Some smaller islands in Ha Long Bay

Overall, Vietnam's mobile infrastructure is among the best in Southeast Asia. You should not have connectivity issues in any area where tourists typically visit.