Vietnam · roaming cost calculator
eSIM or Carrier Roaming for Vietnam: Dollar-for-Dollar Comparison
We earn commissions from some links below. This does not affect the price comparisons or rankings shown on this page. Editorial policy
Travel eSIM options for Vietnam: rates and coverage
Airalo's Vietnam plans carry a 14-day refund policy for unused eSIMs. Coverage runs on Viettel's 5G network from $1.37/GB.
Get eSIMIn Vietnam, Holafly runs on Viettel with unlimited data. Heavy users streaming video save compared to paying $1.37/GB per GB elsewhere.
Get eSIMSaily connects to Viettel in Vietnam at $1.37/GB with VPN included. Travelers who regularly use public WiFi in cafes, hotels, or transit hubs avoid paying $13/month for a separate VPN subscription.
Get eSIMNomad offers straightforward Vietnam plans on Viettel's 5G network from $1.37/GB. Simple checkout, no frills.
Get eSIMCompare providers: Airalo vs Holafly · Airalo vs Saily · Airalo vs Nomad · Holafly vs Saily · Holafly vs Nomad · Saily vs Nomad
The full picture
Published carrier rates for Vietnam travel data
Every major carrier's published Vietnam rate, side by side, with the eSIM winner highlighted.
| Carrier | Plan type | Daily | 7-day | Speed | Data limit |
|---|---|---|---|---|---|
| AT&T | International Day Pass | $10.00source | $70.00 | LTE | Plan data |
| Verizon | TravelPass | $10.00source | $70.00 | LTE | Plan data |
| T-Mobile | Magenta (high-speed add-on) | Free*source | $0–105 | 256kbps* | Throttled |
| eSIM · Airalo | 1 GB · 7 days | — | $1.37 | LTE / 5G | 1 GB |
*T-Mobile includes data at 256kbps free; high-speed access is a $5–15/day add-on, shown here as a 7-day range.
Compare all carrier roaming plans to see how AT&T, Verizon, T-Mobile, Vodafone, and EE stack up against eSIM providers.
Pay-per-use cost audit
Vietnam data bill scenarios: AT&T without a day pass
Here is how the first morning in Vietnam plays out on AT&T pay-per-use (no plan active). You wake up, open Google Maps to find coffee nearby (~50 MB). You check email and a few attachments load (~5 MB). You scroll Instagram for 15 minutes while you wait (~20 MB). That totals 75 MB. At $2.05/MB, your first morning costs $154 before 9 AM. A 5-minute FaceTime call to confirm plans adds $154. By noon, after another hour of navigation, the bill reaches $410. These are AT&T's published pay-per-use charges. Source: AT&T rate card, June 2026.
Personalize your savings
How much will you save with an eSIM in Vietnam?
Adjust your trip length, carrier, and data habits to see your exact savings.
Network coverage
Vietnam cellular coverage by operator
Verizon TravelPass connects to Vinaphone in Vietnam at $10/day. A travel eSIM connects to the same Vinaphone network at $1.37/GB. The coverage map for AT&T roaming in Vietnam and the coverage map for a travel eSIM are both drawn by Vinaphone. They are the same map. Airalo deliver the same 5G signal for less. Vinaphone supports both 5G and LTE in Vietnam. Neither AT&T roaming nor travel eSIMs restrict you to the slower LTE band. Both give you the fastest available signal. AT&T charges $10/day for it. An eSIM charges $1.37/GB. Vietnam has urban-only 5G coverage. Viettel launched 5G in Hanoi and HCMC in 2024; expanding to major cities Average download speeds reach 52 Mbps on Vinaphone's network — identical whether you connect through a carrier roaming pass or a travel eSIM. Viettel has the widest coverage in Vietnam, reaching remote northern mountains where Vinaphone and Mobifone have gaps.
Viettel provided solid 4G coverage across the Hai Van Pass route and in Sapa mountain area. Vinaphone dropped in remote Ha Giang.
Pricing breakdown
Vietnam data cost comparison: what carriers charge vs eSIM
Here is the 14-day cost breakdown for Vietnam. AT&T International Day Pass: $140. Verizon TravelPass: $140. T-Mobile high-speed add-on: $210 (256 Kbps free tier is too slow for maps or video calls). eSIM 20GB plan on Viettel: $27.49. That is $112.51 less than AT&T, a 80% reduction for the same 5G connectivity.
T-Mobile's international add-on in Vietnam costs $15/day, the highest daily rate of the three major US carriers. AT&T is $10/day. Verizon is $10/day. An eSIM on Viettel averages $1.96/day when you buy the 20GB plan upfront. Local Viettel SIM costs $3 for 6GB/30 days — the cheapest in Southeast Asia, but registration hassle adds 20 min.
Choosing the right eSIM tier for Vietnam depends on trip length and daily habits. Available tiers: 1GB at $3.49 ($3.49/GB), 3GB at $7.49 ($2.50/GB), 5GB at $11.09 ($2.22/GB), 10GB at $19.31 ($1.93/GB), 20GB at $27.49 ($1.37/GB). A 1.5 GB/day user on a 14-day trip needs roughly 21GB. The unlimited daily option at $4.43/day works out to $62.02 total. Vietnam mobile data prices are among the lowest globally — local prepaid costs 80% less than airport eSIM purchases. Travelers in Vietnam average 1.2GB of mobile data per day, so a 14-day trip needs roughly 17GB.
Trip cost breakdown
Vietnam trip cost breakdown: 3 days, 14 days, 30 days
Three days in Vietnam costs $30 on AT&T at $10/day. A 2GB eSIM on Viettel covers the same period for $7.49. Difference: $22.51.
Fourteen days costs $140 on AT&T — more than many flights to Vietnam. A 20GB eSIM on Viettel covers 15GB of photos and video calls for $27.49. Difference: $112.51 (80%).
Thirty days on AT&T costs $300. A 50GB eSIM on Viettel covers 50GB for $68.59. Difference: $231.41 over the month. AT&T rate: $10/day regardless of data consumed. Rates checked June 2026.
Airport options
First-day data options in Vietnam
Viettel and Vinaphone and Mobifone staff the SIM counter at Tan Son Nhat (SGN) / Noi Bai (HAN). Service is in Vietnam's official language; English assistance is inconsistent. Passport or ID is required for SIM registration. The counter process takes 10-15 min and requires your passport as proof of identity. A 1GB eSIM at $3.49 is purchased online in English before you board — no language barrier, no forms to fill out at the counter. City shops charge $3-8 for 4-10GB / 30 days if you have time after arrival.
Local alternative
Local SIM vs eSIM in Vietnam
Viettel and Vinaphone and Mobifone staff the local SIM counter in Vietnam. Service is in the local language; English help varies by location. Local SIMs cost $3-8 for 4-10GB / 30 days, need a passport for registration. A travel eSIM at $3.49 is purchased in English online — no language barrier during activation.
Data planning
Vietnam data plan sizing for 8-day visits
In Vietnam, a typical travel day looks like this: 1 hour of navigation (50 MB), 1 hour of social media (80 MB), 2 WhatsApp calls (50 MB), 30 photo uploads (300 MB). That totals roughly 480 MB, below the 1.2GB average, which leaves room for streaming. A 8-day trip needs 10GB.
10GB of data covers uploading roughly 1024 full-resolution photos to cloud storage. That is 128 photos per day for 8 days, plus maps and messaging. The plan costs $19.31. AT&T's equivalent roaming: $80. For heavy data users, unlimited daily plans start at $4.43/day — still cheaper than any carrier roaming pass.
Connectivity
Vietnam data strategy: WiFi vs eSIM
Free WiFi common in cafes and hotels in tourist areas; Vietnam is a major digital nomad hub Airport WiFi in Vietnam typically limits free sessions to 30-60 minutes after landing. Once that runs out, you are relying on hotel WiFi or paying airport day-pass rates. An eSIM on Viettel activates before you board and gives you 5G speeds from the moment you land — no session timers.
Plan your data
Your Vietnam data budget explained
Viettel provides the cellular infrastructure in Vietnam. AT&T pays Viettel a wholesale rate for roaming access, then bills you $10/day. Travel eSIM providers also access Viettel's network and charge $1.37/GB at retail. For a 8-day trip: AT&T $80, eSIM $27.49.
Vietnam has two mobile operators: Vinaphone and Viettel Mobile. When AT&T or Verizon customers roam here, their calls and data pass through these exact networks. A travel eSIM reaches Vinaphone or Viettel Mobile directly at $1.37/GB — the service is identical; the roaming markup is not.
Airport SIM counters at Tan Son Nhat (SGN) / Noi Bai (HAN) charge $5-15 for 6-20GB / 15-30 days after a 10-15 min wait — still more than a 20GB eSIM at $27.49. Local prepaid SIMs in Vietnam run $3-8 for 4-10GB / 30 days, requiring an in-person stop and sometimes a passport copy. An eSIM at $27.49 skips that entirely. Some of the cheapest mobile data in the world; prices stable year-round
Quick reference
Vietnam Travel Essentials
113/115
113, 115 are the emergency numbers in Vietnam. Different numbers may route to different services — save all of them before your trip. Emergency calls work from any mobile device, including travel eSIMs.
Type A/C
US plugs (Type A flat two-prong and Type B three-prong) fit Vietnam's outlets directly. No adapter is needed for phones, laptops, or standard US electronics. Voltage is 120V — compatible with dual-voltage US chargers.
ICT (UTC+7)
VND (₫)
Tap-to-pay (Apple Pay, Google Pay) is accepted at most stores and restaurants in Vietnam. Visa and Mastercard work at virtually all merchants. Carry a small amount of local VND for markets, taxis, and small vendors that do not have card readers.
Good to know
Power sockets in Vietnam are Type A/C type. US and UK plugs don't fit without an adapter. A depleted phone ends your eSIM connectivity regardless of remaining data balance.
Good to know
Vietnam's emergency number is 113/115, not 112. Both carrier roaming SIMs and eSIMs can dial emergency numbers without an active data plan.
Step by step
How to cut roaming charges on a Vietnam trip
- Check your phone supports eSIM (iPhone XS or newer, most Samsung Galaxy S20+) — 5G coverage is urban-only on Viettel
- Pick a 1GB Vietnam plan on Airalo for $3.49 — payment takes under two minutes and your QR code arrives instantly. Compare providers if you want to see alternatives first.
- Install the eSIM via the QR code Airalo sends to your email — do this before your flight to Tan Son Nhat (SGN) / Noi Bai (HAN) so it activates the moment you land
- On iPhone: tap Settings > Cellular, select your carrier SIM (not the Airalo eSIM), tap Cellular Data Options, and set Data Roaming to off. Full instructions with screenshots in the data roaming guide.
- On Samsung Galaxy at Tan Son Nhat (SGN) / Noi Bai (HAN): open the notification shade, tap the SIM switcher, and select your Airalo eSIM — Viettel registers automatically
- On Google Pixel: go to Settings > Network > Calls and SMS > WiFi Calling and enable it — your home number stays reachable in Vietnam without any voice roaming charge
Data tips
Vietnam trip data discipline: what to disable
Photo backup is a silent data drain. Google Photos and iCloud auto-upload on cellular will consume 20-100 MB per photo session depending on image quality. Turn off auto-backup on cellular before landing in Vietnam. Back up manually over hotel WiFi instead. A 10-photo session in RAW format can exceed 500 MB.
Regional context
Local data rules and tips for Vietnam
A few things to know before turning off carrier roaming in Vietnam:
VPNs not illegal but government blocks many VPN services; Facebook and Google generally accessible This applies equally to carrier roaming and eSIM connections — switching from roaming to eSIM does not change your VPN access in Vietnam.
Vietnam SIM registration: Passport required; real-name registration mandatory since 2018. A travel eSIM purchased abroad bypasses local SIM registration requirements at the point of sale.
Grab is essential for ride-hailing; works with international phone numbers
Zalo is Vietnam's dominant messaging app — locals prefer it over WhatsApp
Vietnam has extremely cheap local SIM data — often under $1/GB from carrier stores
Many cafes in Ho Chi Minh City and Hanoi have passwords displayed on receipts or walls
Vietnam blocks some foreign gambling and adult content sites at ISP level
Free WiFi common in cafes and hotels in tourist areas; Vietnam is a major digital nomad hub Roaming passes charge $10/day to fill WiFi gaps. An eSIM covers the same connectivity at $1.37/GB.
Local SIM cards in Vietnam are extremely cheap but require passport registration — eSIM skips this step entirely.
Dry season varies by region; north is best October-April, south November-April
Forgot your eSIM?
Vietnam eSIM installation after arrival: the WiFi route
Forgot to buy an eSIM before flying to Vietnam? Three options, ranked by total cost.
Option 1 — Airport WiFi install ($3.49 total): Tan Son Nhat (SGN) / Noi Bai (HAN) has free WiFi. All four providers (Airalo, Holafly, Saily, Nomad) support post-arrival purchase over WiFi. Buy a 1GB plan for $3.49. No extra charge beyond the plan.
Option 2 — Hotel lobby WiFi install ($3.49 total): If airport WiFi failed, hotel lobby WiFi works just as well. Check in, get the password, complete the eSIM install. Same $3.49 cost.
Option 3 — Emergency carrier download ($10 + $3.49 total): Use ~5 MB of AT&T pay-per-use data to download the provider app ($10). Install the eSIM over the app, then disable carrier data. Total cost: $13.49.
Vietnam FAQ
Vietnam eSIM & roaming questions
How much does carrier roaming cost in Vietnam?
AT&T: $10/day ($70/week). Verizon: $10/day ($70/week). T-Mobile: free but throttled to 256 Kbps; high-speed add-on costs $15/day. Travel eSIM on Viettel: $3.49 for 1GB. All four options route through the same Viettel towers in Vietnam. The price gap between carrier roaming and eSIM is $70 versus the eSIM rate for a 7-day trip.
Is T-Mobile's free international data fast enough in Vietnam?
No. T-Mobile's free tier in Vietnam runs at 256 Kbps — too slow for GPS navigation, video calls, or any app that loads images. You can send basic text messages and that is about it. The high-speed upgrade costs $15/day, matching AT&T's roaming fee. A travel eSIM on Viettel provides full 5G speeds at $1.37/GB with no daily activation triggers.
How is my roaming bill calculated in Vietnam?
Relying on hotel WiFi does not prevent roaming charges in Vietnam. AT&T's per-day charge fires from any background cellular contact — your phone does not need an active app, just a brief tower handshake. Per-MB billing at $2.05/MB is even more dangerous with background syncs. T-Mobile's 256 Kbps free tier sidesteps per-day billing but is too slow for apps. A travel eSIM at 1GB for $3.49 gives you full 5G and locks the total cost before you board.
What is the best data plan for a 1-month stay in Vietnam?
For a 30-day trip at 1.5 GB/day average, total usage runs 45 GB. AT&T International Day Pass: $300 for the month. T-Mobile high-speed add-on: $450. A travel eSIM on Viettel at $1.37/GB for 45 GB costs roughly $61.65. For stays over 2 weeks, also consider a local SIM purchased in Vietnam — local prepaid cards often run $10-25 for 20-50 GB at full local speeds with no international markup. Rates checked June 2026.
How much does 1 GB of roaming data cost in Vietnam?
On AT&T without a plan: roughly $2,050 (at $2.05/MB). With AT&T International Day Pass: $10/day — you get access to your home plan's data allowance, but the day fee applies regardless of usage. With a travel eSIM: $1.37 per GB on Viettel's 5G network. The eSIM is the only option where you pay strictly for what you use at a predictable, low per-GB cost.
Which US carrier has the best roaming deal for Vietnam?
None of the three US carriers offer a genuinely good deal in Vietnam. AT&T: $10/day. Verizon: $10/day. T-Mobile: free at 256 Kbps (unusable for navigation), $15/day for full speed. A travel eSIM on Viettel starts at $1.37/GB — a 7-day trip at average usage costs $14.39 versus $70 for AT&T. No carrier matches the eSIM on per-GB cost.
Can I use a VPN with my eSIM in Vietnam?
VPN access in Vietnam is restricted. VPNs not illegal but government blocks many VPN services; Facebook and Google generally accessible A travel eSIM using international routing may provide different access than a local SIM, but results vary by carrier path. Neither roaming nor an eSIM guarantees unrestricted VPN access in Vietnam — download and configure your VPN before departure.
Do local apps in Vietnam require a local SIM or does an eSIM work?
Most local apps in Vietnam — ride-hailing, food delivery, transit — do not require a local SIM number to function. They require only a data connection, which a travel eSIM provides at $1.37/GB on Viettel's 5G network. Some banking and two-factor authentication apps require a local phone number for SMS verification. For those cases, keep your home SIM active alongside the eSIM — your home number handles SMS while the eSIM handles data.
Is one eSIM enough for a multi-country Asia trip that includes Vietnam?
Multi-country Asia eSIM plans exist and cover many combinations — Japan, South Korea, Thailand, Singapore, and others in a single data bucket. AT&T and Verizon charge $10/day in each country separately, so a 3-country trip at 3 days each costs $90. A regional Asia eSIM for the same 9 days runs $15-$40 total. Check plan coverage maps — Vietnam may be included in a regional plan, or you may need a Vietnam-specific plan plus a regional one.
How much does carrier roaming cost for a week in Vietnam?
AT&T: $70/week (International Day Pass at $10/day). Verizon: $70/week (TravelPass). T-Mobile: free at 256 Kbps or $105/week for usable speed. The cheapest eSIM for Vietnam starts at $1.37/GB on Viettel's 5G network — better per-GB value than all three carriers.
Fact check
Vietnam travel data: correcting the record
EU roaming is free for Americans
EU roaming-within-the-EU rules apply only to SIM cards issued by EU-based carriers. AT&T and Verizon are US carriers — they charge full international day pass rates in every EU country. AT&T's International Day Pass runs $12/day in EU destinations. Verizon TravelPass is $10/day. A travel eSIM on Viettel covers Vietnam for $3.49 total. Rates checked June 2026.
You need to unlock your phone to use an eSIM
eSIM installation does not require an unlocked phone in most cases. iPhones sold in the US since iPhone 14 are sold unlocked by law. iPhones XS through 13 require unlocking to add a foreign carrier eSIM, but AT&T, Verizon, and T-Mobile all offer free unlocking after your contract ends. Samsung Galaxy S20 and newer models support eSIM on both locked and unlocked variants. Check your carrier's unlock policy before your trip to Vietnam.
Roaming charges only apply to data
US carrier international plans charge separately for data, calls, and texts. AT&T's International Day Pass at $12/day includes data but charges $0.25–$1.50/minute for calls beyond the bundled allocation. Incoming voicemail retrieval can trigger per-minute roaming charges even when you make no outgoing calls. A data-only eSIM in Vietnam at $3.49 covers data and uses WhatsApp or FaceTime for voice at no additional carrier cost. Rates checked June 2026.
Our recommendation
Vietnam data cost verdict
For heavy data users in Vietnam: VPN usage is restricted in Vietnam, and Saily includes NordVPN-grade encryption on every plan. That keeps your browsing private on public WiFi and hotel networks. Plans on Viettel start at $3.49 for 1GB. Holafly is the alternative if you need unlimited data — plans start at $2.99/day with no data cap.
AT&T charges $10/day in Vietnam. An eSIM costs $1.37.
AT&T bills $10/day the moment your phone connects abroad. An eSIM charges one flat fee of $1.37 for the whole trip.
Get a Vietnam eSIM