For most trips to Vietnam, the best eSIM is a 5 or 10 GB fixed plan. In our check, ICY SIM was cheapest at US$8 for 5 GB and US$16 for 10 GB (about A$23), with Nomad close behind at US$17. If you want unlimited, Nomad and Saily sell 5-day plans for about US$18–19. Roaming from Australia costs much more: Telstra charges $10 a day in Vietnam.
ICY SIM is our product and it’s in this comparison, judged the same way as the others. Prices were checked on 27 October 2026 (esimDB, provider sites and our live prices) and are shown in AUD at US$1 = A$1.42.
- 5 GB, 30 days: ICY SIM about A$11 (US$8), then Nomad A$14, Saily and Airalo about A$16.
- 10 GB, 30 days: ICY SIM about A$23 (US$16), Nomad A$24, Saily and Airalo about A$26.
- Unlimited: Nomad 5 days A$26 (2 GB a day), Saily 5 days A$27 (5 GB a day), Airalo 7 days A$38.
- Roaming in Vietnam: Telstra $10 a day, Optus $5–10 a day, Vodafone $5 a day.
- A two-week trip from Hanoi to Ho Chi Minh City usually needs about 10 GB.
Vietnam eSIM prices compared
| Provider | 5 GB, 30 days | 10 GB, 30 days | 20 GB, 30 days | Unlimited |
|---|---|---|---|---|
| ICY SIM | A$11 (US$8) | A$23 (US$16) | A$34 (US$24) | No unlimited plan |
| Nomad | A$14 (US$10) | A$24 (US$17) | A$36 (US$25) | 5 days A$26 (2 GB a day) |
| Saily | A$16 (US$10.99) | A$26 (US$17.99) | A$41 (US$28.99) | 5 days A$27 (5 GB a day) |
| Airalo (Xin Chao) | A$16 (US$11) | A$26 (US$18) | A$41 (US$29) | 7 days A$38 (3 GB a day) |
| Holafly | Unlimited only | Unlimited only | Unlimited only | 7 days A$39 (US$27.50) |
Prices are rounded to the nearest dollar. “Unlimited” plans slow down after the daily amount shown, and Holafly limits hotspot sharing to 1 GB a day. ICY SIM’s Vietnam plan runs on Vinaphone and Vietnamobile; Holafly lists Vinaphone. Live prices are on our Vietnam page.
How much data do you need in Vietnam?
| Trip | Typical use | Plan size |
|---|---|---|
| A week in Hanoi and Ha Long Bay | Maps, Grab, WhatsApp, Instagram | 3–5 GB |
| Two weeks, north to south | + train and bus bookings, photos, some video | 10 GB |
| A month, or working from Da Nang | Video calls, laptop hotspot | 20 GB or unlimited |
Cafés and hotels across Vietnam have Wi-Fi, and it’s usually fast. Mobile data is what you need on the road: Grab rides, Google Maps in old-town lanes, and translation apps at markets.
Telstra, Optus and Vodafone roaming in Vietnam
| Carrier | Price in Vietnam | Data | 10 days costs |
|---|---|---|---|
| Telstra International Day Pass | $10 a day | 2 GB a day | $100 |
| Optus Daily Roaming (Choice Plus) | $5 a day | 5 GB a day | $50 |
| Optus $10 Roaming Pass | $10 a day | 1 GB a day | $100 |
| Optus prepaid | $45 pack | 10 GB for 28 days | $45 |
| Vodafone $5 Roaming | $5 a day | Your plan’s data | $50 |
| Travel eSIM (ICY SIM) | One-off | 10 GB for 30 days | about A$23 |
Vietnam is in Telstra’s $10 zone and in Optus Zone 1. Check Vodafone’s list before you go, as it changes. Roaming includes calls and texts on your Australian number; the eSIM is data only. More in our Telstra, Optus and Vodafone roaming guides. For every destination in one table, see our travel eSIM guide for Australians.
How to set up a Vietnam eSIM before you fly
- Check your phone supports eSIM on our compatible devices list.
- Buy a Vietnam plan and install it at home on Wi-Fi. Validity starts when you first use it in Vietnam.
- When you land in Hanoi, Da Nang or Ho Chi Minh City, set the eSIM as your mobile data line and turn on data roaming for the eSIM only.
- Turn data roaming off for your Australian line, so no daily roaming fee starts.
- Back home, switch mobile data back to your usual line.
Going to Vietnam?
Vietnam eSIM on Vinaphone and Vietnamobile: 5 GB for US$8, 10 GB for US$16.
See Vietnam plans →Which Vietnam eSIM should you pick?
- A normal holiday: 5 or 10 GB fixed. ICY SIM was cheapest for 5, 10 and 20 GB in our check, with Nomad close behind.
- Heavy use for a few days: Saily’s 5-day unlimited (5 GB a day at full speed) or Nomad’s (2 GB a day).
- A week of heavy use: Airalo’s 7-day unlimited at US$27, or Holafly at US$27.50.
- Vietnam plus Thailand or Bali: compare a regional Asia plan with one plan per country. See best eSIM for Thailand and best eSIM for Bali.
