Vietnam
eSIM

Why Viettel Dominates Rural Vietnam

Vietnam has three main carriers: Viettel (military-owned), MobiFone, and Vinaphone. Viettel controls over 50% of mobile subscribers and has built the most extensive rural infrastructure — critical for a country where the most spectacular landscapes are far from cities. The northern mountains (Sapa, Ha Giang, Cao Bang), the central highlands, and the remote fishing villages of the south all have better Viettel coverage than competitors. For the Ha Giang Loop specifically, Viettel is the only carrier with meaningful signal on the mountain passes.

Ha Noi: Old Quarter Navigation

Hanoi's Old Quarter is a maze of 36 ancient streets where addresses are confusing and motorbike traffic is dense. Google Maps is non-negotiable here. Viettel 4G covers the entire Old Quarter including the narrow alleys. The Hoan Kiem Lake area, Temple of Literature, and Ho Chi Minh Mausoleum district all have strong signal. Essential apps in Hanoi: Grab (for motorbike and car), Be (local Grab competitor, sometimes cheaper), and Foody for restaurant finding.

Ho Chi Minh City: The Motorbike City

HCMC (Saigon) is one of the most navigationally complex cities in Asia due to its one-way systems, motorbike density, and constantly changing street-level detail. District 1 (Ben Thanh Market, Bui Vien backpacker street, Reunification Palace) has excellent 4G/5G. District 3, Binh Thanh, and the trendy Thu Duc creative district all have strong Viettel signal. The Cu Chi Tunnels (70km northwest of HCMC) are on the surface — Viettel 4G works at the tourist site. Download Google Maps offline for Ho Chi Minh City as backup for low-signal alleys.

Ha Long Bay: Boat and Island Coverage

Ha Long Bay cruises are the most popular tourist experience in Vietnam. Signal reality: Ha Long City and the cruise departure pier have strong 4G. Once your junk boat is in the bay among the limestone karsts, signal varies significantly. Some areas of the bay maintain 4G (the main cruise routes near Cat Ba Island); the outer, more remote karst areas drop to 3G or no signal. This is consistent across all Vietnamese carriers. Use onboard time to enjoy the scenery and upload photos when back at the pier.

The Ha Giang Loop: Why This eSIM Matters Most Here

The Ha Giang Loop is a 350km mountain motorbike circuit in Vietnam's northernmost province, bordering China. It passes through some of the country's most dramatic scenery — the Dong Van Karst Plateau Geopark (UNESCO), Ma Pi Leng Pass, and ethnic minority hill tribe villages. Viettel is the only carrier with consistent signal on this route. MobiFone and Vinaphone drop out on the mountain passes. For navigation on roads where a wrong turn leads to a cliff edge, having Viettel signal is not optional — it is the reason experienced travellers specifically request Viettel before doing the loop.

Hoi An and the Central Region

Hoi An Ancient Town (UNESCO World Heritage Site) has excellent Viettel 4G throughout the lantern-lit streets, the covered Japanese Bridge, and the tailoring district. Da Nang (the nearest major city, 30km north) has 5G in the city center. The Hai Van Pass between Da Nang and Hue — famous from the BBC Top Gear Vietnam special — has Viettel 4G on most of the pass. Hue's Imperial Citadel is well-covered. The train route between Da Nang and Hue (one of Asia's most scenic rail journeys) maintains 4G on the coastal cliff section.