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📶 Fix Slow eSIM Vietnam: Troubleshooting Guide for Travelers in 2025
Many travelers report issues of slow eSIM speed when arriving in Vietnam. If you are experiencing fix slow eSIM Vietnam problems, the cause usually comes from APN configuration, network congestion, device compatibility, or Fair Use Policy (FUP) throttling. This guide provides step-by-step solutions, real case studies, and tested speed results so you can restore smooth 4G/5G connectivity during your trip.
👉 Related reading: Vietnam 5G eSIM Coverage 2025
🛠 Main Causes of Slow eSIM in Vietnam
- Incorrect APN settings – Without the right APN, devices may only connect at 3G speeds.
- Device compatibility – Phones must support Vietnam’s 4G/5G bands (LTE B3, B7, B8, B28, 5G n41).
- Network congestion – Peak hours (6–9 PM) reduce speeds, especially in big cities.
- Fair Use Policy – Daily caps like 5GB (Viettel) or 6GB (MobiFone) trigger throttling.
- Roaming setting enabled – Prevents devices from using local towers effectively.
📲 Step-by-Step Fix to Improve eSIM Speed
1. Correct APN Settings
Go to Settings → Mobile Network → Access Point Names. Set the correct APN:
- Viettel:
v-internet - MobiFone:
m-waporm3-world
2. Check Device Band Support
Ensure your phone supports 4G LTE B3 (1800 MHz) & B7 (2600 MHz). For 5G, Band n41 (2500 MHz) is essential in Hanoi and Ho Chi Minh City. See official GSMArena to check your model specs.
3. Reinstall the eSIM Profile
Delete and reinstall the eSIM QR code profile, then restart your device. Many fixes only apply after a full reboot.
4. Run Speed Tests
Use Ookla Speedtest app to measure performance. Test at morning, afternoon, and evening to identify congestion patterns.
5. Switch Carrier if Possible
Some eSIMs allow carrier switching (e.g., between Viettel and MobiFone). Try both to see which network delivers better speed in your area.
📊 Ho Chi Minh City Traveler
User: John from the UK, iPhone 13 Pro
Plan: Viettel eSIM, 5GB/day
Problem: Evening speed <2 Mbps in District 1
Fix: Corrected APN to v-internet, restarted device
Result: Download increased to 35 Mbps, Upload 15 Mbps
🌐 Speed Test Results in Vietnam (2025)
| City | Carrier | Avg 4G Speed | Avg 5G Speed | Notes |
|---|---|---|---|---|
| Hanoi | Viettel | 40 Mbps | 180 Mbps | Stable in Old Quarter |
| Ho Chi Minh City | MobiFone | 35 Mbps | 150 Mbps | Reliable in District 1 & 3 |
| Da Nang | Viettel | 38 Mbps | 160 Mbps | Strong near My Khe Beach |
| Phu Quoc | MobiFone | 25 Mbps | 90 Mbps | Congestion during holidays |
📌 Extra Tips to Fix Slow eSIM Vietnam
- Turn off VPN when not needed, as it slows down traffic.
- Avoid continuous hotspot tethering—it reduces throughput.
- Track daily quota with apps like My Viettel or MobiFone Next.
- If throttled by FUP, wait until next day cycle resets high-speed data.
✅ Conclusion
Most fix slow eSIM Vietnam issues can be solved with correct APN, confirming device compatibility, and monitoring data usage against FUP. By following these steps, you can restore fast 4G/5G internet across major tourist destinations in Vietnam.
🚀 Buy Reliable Vietnam eSIM Plans
To avoid hassle, purchase trusted Vietnam eSIMs before departure:
- Viettel eSIM: 5GB/day, $13.50–$18.50, excellent nationwide coverage.
- MobiFone 30 Days: 6GB/day + VN number, $18.50, includes free calls.
- MobiFone 20 Days: 4GB/day + VN number, $14.50, best value 2025.
📩 Contact: WhatsApp: +84 98 307 49 15 | LINE ID: anyaxiaoying | Email: info@govnsim.com