Galaxy S25 Dual SIM in Vietnam: Complete Guide for Travelers 2025

The Samsung Galaxy S25 series supports advanced dual SIM capabilities that make it particularly convenient for international travelers visiting Vietnam. Whether you prefer a combination of physical SIM + eSIM or dual eSIM profiles, the S25 lets you keep your home number active while using a local Vietnamese eSIM for fast, affordable data throughout your trip.

🔧 Dual SIM Options on Galaxy S25

The S25 lineup (S25, S25+, S25 Ultra) offers different SIM configurations depending on the device variant:

• Physical SIM + eSIM — common on unlocked global models.
• Dual eSIM — available on many European/Asian variants.
• Single SIM — some US carrier models may restrict SIM usage.

When both lines are active in Vietnam, most travelers keep their home SIM for calls/SMS and install a Vietnam eSIM for high-speed 4G/5G data.

📱 How to Enable Dual SIM on Galaxy S25

1. Add your SIMs: Insert a physical SIM or go to Settings → Connections → SIM Manager → Add eSIM to scan your QR code.
2. Label each SIM: Name them (e.g., “Home” and “Vietnam Data”) to avoid confusion.
3. Select defaults: Choose which SIM handles calls, messages, and data.
4. Enable Dual SIM always on: This lets both lines stay reachable, though battery usage may increase.
5. Check APN settings:
   • Viettel: v-internet
   • MobiFone: m-wap
   • VinaPhone: m3-world

🌍 Why Dual SIM Is Useful in Vietnam

Running two lines helps you stay connected no matter where you travel in Vietnam. Typical reasons visitors use dual SIM mode include:

• ✔ Keeping the home number active for banking, SMS, or authentication.
• ✔ Using a Vietnam eSIM for faster local data on the go.
• ✔ Switching between networks if moving through areas with varied coverage.
• ✔ Separating work and personal communication without carrying two phones.

📶 4G/5G Performance on Galaxy S25 in Vietnam

The Galaxy S25 handles Vietnam’s modern mobile networks very well. Major carriers provide broad 4G/5G coverage across Ho Chi Minh City, Da Nang, and Hanoi, with Viettel typically performing strongest on longer routes and rural areas.

• Viettel: Most consistent connectivity on intercity and mountain routes.
• MobiFone: Smooth performance in city centers and commercial districts.
• VinaPhone: Good speeds in urban and coastal zones.

🔧 Common Dual SIM Issues & Fixes

• No service on the second SIM: Check SIM Manager and ensure both profiles are enabled.
• Data not switching: Turn on “Allow mobile data switching.”
• eSIM menu missing: Some US carrier models disable eSIM; unlocked versions are required.
• Battery drain: Disable Dual SIM always on if you do not need both lines active 24/7.

📦 Best GoVnSIM eSIM Plans for Galaxy S25 Dual SIM

All plans below are fully compatible with Galaxy S25 global and dual eSIM variants:

• Viettel eSIM — 5GB/day, 15 or 30 days; excellent for travelers heading beyond major cities. View Viettel eSIM
• Vietnam eSIM 30 Days (MobiFone) — 6GB/day with a Vietnamese phone number; great for OTP and calls.
• Vietnam eSIM 20 Days — 4GB/day with local number; ideal for mid-length stays.
• Vietnam eSIM with Phone Number — 3GB/day, 10–30 days; supports calls, SMS, and verification apps. Check plans here

📋 Checklist Before You Arrive in Vietnam

• ✔ Ensure your Galaxy S25 is unlocked.
• ✔ Update to the latest One UI / Android version.
• ✔ Install your home SIM and Vietnam eSIM in advance when possible.
• ✔ Set data preference to your Vietnam eSIM.
• ✔ Save APN settings for Viettel, MobiFone, or VinaPhone.

📣 Plan Your Connectivity

If you prefer a setup with local calls and OTP support, explore our Vietnam eSIM with Phone Number options for smoother app verification during your stay.

Heading toward rural or mountainous areas after your city visit? The Viettel eSIM for Tourists offers the most reliable coverage across Vietnam.

For a smooth arrival in Ho Chi Minh, Hanoi, or Da Nang, you can also arrange a Vietnam airport pickup to reach your hotel comfortably after landing.

Support: WhatsApp +84 98 307 49 15 · LINE: anyaxiaoying · Email: info@govnsim.com

Part of Heera Travel Group – Explore more Vietnam tours at HeeraTravel.com.