Savings Calculator
Vietnam eSIM Savings Calculator: Roaming vs eSIM (2026)
A 8-day trip to Vietnam costs $80 in AT&T roaming. A 20GB eSIM costs $27.49 on Viettel's network. You save $52.51 (66%). Enter your trip length below to calculate your savings.
Your carrier's roaming rate in Vietnam
| Carrier | Plan | Daily Rate | 7-Day Cost |
|---|---|---|---|
| AT&T | International Day Pass | $10/day | $70 |
| Verizon | TravelPass | $10/day | $70 |
| T-Mobile | Magenta (high-speed add-on) | $15/day | $105 |
AT&T International Day Pass
AT&T's day pass covers data and calls to the US. Texts to local Vietnam numbers are billed separately at $0.25-$0.50 per SMS in some plan tiers. Verify before sending local contact messages abroad.
Verizon TravelPass
Verizon caps high-speed data at a daily threshold before throttling in Vietnam. Once throttled, the $10/day charge continues. An eSIM at $1.37/GB delivers full-speed data up to the plan's GB ceiling with no hidden throttle.
T-Mobile Magenta (high-speed add-on)
T-Mobile's day pass covers data and calls to the US. Texts to local Vietnam numbers are billed separately at $0.25-$0.50 per SMS in some plan tiers. Verify before sending local contact messages abroad.
eSIM alternative cost for Vietnam
Plan tiers for Vietnam
| Tier | Price | Per GB |
|---|---|---|
| 1GB | $3.49 | $3.49 |
| 3GB | $7.49 | $2.50 |
| 5GB | $11.09 | $2.22 |
| 10GB | $19.31 | $1.93 |
| 20GBBest fit | $27.49 | $1.37 |
Unlimited daily option
| Days | Price | Per Day | Discount |
|---|---|---|---|
| 1 days | $4.25 | $4.25 | 4% |
| 3 days | $12.23 | $4.08 | 8% |
| 7 days | $28.53 | $4.08 | 8% |
| 14 days | $55.20 | $3.94 | 11% |
| 30 days | $108.98 | $3.63 | 18% |
Which provider covers Vietnam
The primary provider for Vietnam is Airalo, connecting to Viettel's 5G network. Compare all eSIM providers
Savings breakdown
| Trip Length | AT&T | Verizon | T-Mobile HS | eSIM | You Save |
|---|---|---|---|---|---|
| 3 days | $30 | $30 | $45 | $11.09 | $18.91 (63%) |
| 7 days | $70 | $70 | $105 | $27.49 | $42.51 (61%) |
| 14 days | $140 | $140 | $210 | $27.49 | $112.51 (80%) |
| 21 days | $210 | $210 | $315 | $27.49 | $182.51 (87%) |
| 30 days | $300 | $300 | $450 | $27.49 | $272.51 (91%) |
Family and group savings
Carrier roaming charges multiply per person. eSIM savings multiply even faster for groups.
Solo traveler
Carrier: $80
eSIM: $27.49
Save $52.51
Couple
Carrier: $160
eSIM: $54.98
Save $105.02
Family of 4
Carrier: $320
eSIM: $109.96
Save $210.04
Trip length calculator
How much data you need
Maps & navigation
50 MB/hr
Social media
80 MB/hr
Video calls
250 MB/hr
Photo uploads
10 MB/photo
Music streaming
70 MB/hr
Web browsing
60 MB/hr
WiFi availability in Vietnam
WiFi in Vietnam is rated good. Free WiFi common in cafes and hotels in tourist areas; Vietnam is a major digital nomad hub
Real savings scenarios for Vietnam
Solo traveler
A solo traveler on AT&T International Day Pass in Vietnam for 8 days: $10/day x 8 days = $80. A 20GB eSIM on Viettel costs $27.49 for the same 8 days. Savings: $52.51 (66%). Both options connect to Viettel's 5G towers. The arithmetic is simple: one fixed payment versus 8 daily charges.
Family trip
A family that takes two international trips per year saves $420.08 annually by switching from AT&T roaming to eSIMs. Per trip: AT&T bills $320 (4 lines x $10/day x 8 days). Four eSIMs cost $109.96 per trip. Over five years, the cumulative savings reach $2100.40.
Business trip
Corporate travel budget impact for Vietnam: a frequent traveler making 4 trips per year saves $90.04 annually by switching from AT&T to eSIM. A team of five making the same trips saves $450.20 per year. Per trip: AT&T $50 vs eSIM $27.49 per person for 5 days. Both connect to Viettel. The savings scale linearly with headcount and trip frequency.
Long-stay and digital nomads
For stays over 14 days in Vietnam, three data options exist. AT&T roaming: $300 for 30 days ($10/day). Most expensive. Travel eSIM: $123.30 for 30 days (two plan purchases). Mid-range, no counter visit. Local prepaid SIM: $3-8 for 4-10GB / 30 days. Cheapest per GB but requires an in-person purchase and passport registration. For stays under 14 days, the eSIM wins on convenience. For stays over 21 days, compare the local SIM price to the eSIM to decide.
Frequent traveler annual savings
A road warrior making 6 trips to Vietnam per year: AT&T: 6 x $80 = $480/year. eSIM: 6 x $27.49 = $164.94/year. Annual savings: $315.06 (66%). That savings figure grows every year carriers maintain their current rates.
Extended stay economics
Snowbirds and seasonal travelers spending 60-90 days in Vietnam: AT&T at $10/day for 60 days costs $600. For 90 days: $900. Two consecutive 30-day eSIM plans on Viettel: $164.40 for 60 days. Three plans for 90 days: $246.60. Savings over 90 days vs AT&T: $653.40.
Frequent flyer savings
Verizon TravelPass compounds faster for families. A family of four taking 2 trips to Vietnam per year: 4 lines x $10/day x 8 days x 2 trips = $640/year. Eight eSIMs (4 per trip x 2 trips): $219.92/year. Family annual savings: $420.08.
Data usage savings
Light data users — email, messaging, occasional maps — use 300-500 MB/day in Vietnam. Over 8 days: 3.2 GB total. AT&T still charges the full $10/day regardless: $80. An eSIM at $1.37/GB for 3.2 GB costs $4.38. Light users overpay the most on carrier day passes — the fixed fee exceeds their actual consumption value.
Couples trip savings
When a couple splits up during the day in Vietnam (one at a museum, one at a market), each phone needs its own data connection for maps and messaging. Hotspot sharing fails when partners are apart. Two individual 20GB eSIMs at $27.49 each: $54.98 total. AT&T for two lines: $160. Independent eSIMs save $105.02 while providing separate data for separate activities.
UK carrier comparison
A UK family of four visiting Vietnam: Vodafone: 4 x GBP6/day x 8 = GBP192. EE: 4 x GBP6/day x 8 = GBP192. Four eSIMs: $109.96. Family savings vs Vodafone: roughly $133.88 USD equivalent.
Airport SIM vs eSIM
Vietnam's Tan Son Nhat (SGN) / Noi Bai (HAN) offers prepaid SIMs at $5-15 for 6-20GB / 15-30 days with a 10-15 min wait. An eSIM installs before your flight and activates on landing — no queue, no paperwork.
Our verdict
The savings math for Vietnam is clear. Solo: $52.51 saved vs AT&T for 8 days. Family of four: $210.04 saved. Annual (2 trips): $105.02 saved. All figures use the same Viettel 5G network. The eSIM costs less at every trip length and every group size.
How much can I save with eSIM in Vietnam?
You save $6.56 per day by switching from AT&T roaming to eSIM in Vietnam. An eSIM averages $3.44/day on Viettel. AT&T charges $10/day. Over a 8-day trip, the total savings are $52.51. Rates verified May 2026.
How much does roaming cost in Vietnam?
AT&T charges $10/day in Vietnam. A 7-day trip costs $70. A 14-day trip costs $140. A 8-day trip costs $80. An eSIM alternative on Viettel starts at $27.49 for the same network. Verified May 2026.
Vietnam network context
Local networks
Vietnam has 2 mobile networks. The primary carriers are Viettel, Vinaphone, Mobifone.
Speed and coverage
Average download speeds reach 52 Mbps in Vietnam. 5G coverage is urban-only. Viettel launched 5G in Hanoi and HCMC in 2024; expanding to major cities Both carrier roaming and eSIM connect to the same local infrastructure.
Connectivity notes
VPN usage is restricted in Vietnam. VPNs not illegal but government blocks many VPN services; Facebook and Google generally accessible
- 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
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.
Frequently asked questions
- How much does AT&T roaming cost for 8 days in Vietnam?
- AT&T International Day Pass charges $10/day in Vietnam. A 8-day trip costs $80 in roaming charges. This activates automatically when your phone connects to a local network abroad.
- Is a travel eSIM cheaper than Verizon TravelPass in Vietnam?
- Verizon TravelPass charges $10/day in Vietnam. A 8-day trip costs $80. A 20GB eSIM covers the same trip for $27.49 on the same local network — saving you 66%.
- How much data do I need for a week in Vietnam?
- Most travelers use 1-2 GB per day for maps, messaging, social media, and light browsing. A 7-day trip needs 7-14 GB. Video calls and streaming push usage to 3+ GB per day. Choose a 10GB or 20GB plan for heavy use.
- Can a family share one eSIM in Vietnam?
- One eSIM stays in one phone, but most eSIM plans allow tethering (personal hotspot). A family of 4 can share a single 10-20GB eSIM through one phone's hotspot instead of paying $10/day per person for carrier roaming.
- Does T-Mobile free data work in Vietnam?
- T-Mobile Magenta includes free data in Vietnam, but speed is capped at 256 Kbps. That is too slow for Google Maps, video calls, or uploading photos. The high-speed add-on costs $15/day.
- How much does a 30-day eSIM cost for Vietnam?
- A 30-day eSIM for Vietnam depends on data volume. Metered plans (5-20GB) typically range from $8 to $35. Unlimited daily plans run $1-2/day. Both connect to the same local network as carrier roaming at a fraction of the cost.
- Is buying a local SIM cheaper than an eSIM in Vietnam?
- Local prepaid SIMs in Vietnam can be cheaper per GB, but require visiting a store, showing ID, and waiting for activation. An eSIM installs before your flight and activates on landing — no queue, no paperwork, no wasted vacation time.
- 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.
- Can one travel eSIM plan cover multiple devices in Vietnam?
- Not directly. A travel eSIM installs on one device and provides data for that device only. To share data across multiple devices in Vietnam, enable the hotspot on the eSIM device — your laptop and tablet connect via WiFi. AT&T International Day Pass at $10/day covers one line; a family of four pays $40/day total. A single eSIM at $1.37/GB on Viettel, shared via hotspot, covers all devices for the cost of one plan — saving $259.45 on a 7-day trip for four people. Rates checked June 2026.
- Does my phone need to be unlocked to use a travel eSIM in Vietnam?
- In most cases, no. eSIM profiles install alongside your existing carrier SIM without requiring an unlock. iPhones purchased in the US after 2020 support dual SIM and eSIM regardless of carrier lock status. Android phones vary — most support eSIM without unlocking, but some budget models require unlocking before a second carrier profile can be installed. US carriers are required to unlock devices after contract fulfillment: AT&T unlocks after 60 days, Verizon after 60 days, T-Mobile after 40 days. If your phone is under contract or recently purchased, check your carrier's unlock policy before your trip to Vietnam. Rates checked June 2026.