Thailand · roaming cost calculator
Thailand Travel Data: Roaming Bill vs eSIM Price
We earn commissions from some links below. This does not affect the price comparisons or rankings shown on this page. Editorial policy
Thailand eSIM plan comparison: four providers
Airalo's app rates 4.8 on iOS and 4.6 on Android. In Thailand it routes through AIS's 5G network at $0.29/GB — real-time data usage tracking shows how much you have left.
Get eSIMIn Thailand, Holafly uses AIS infrastructure with no data ceiling. A 7-day unlimited plan costs $21 — AT&T charges $70 for the same week on the same towers.
Get eSIMIn Thailand, Saily uses AIS's 5G network. The integrated VPN keeps your traffic private on hotel and airport Wi-Fi where packet sniffing is common.
Get eSIMNomad support is email-only with 24-48 hour response times. For Thailand trips on AIS's 5G network at $0.29/GB, the self-service activation process handles most setup scenarios without needing support.
Get eSIMCompare providers: Airalo vs Holafly · Airalo vs Saily · Airalo vs Nomad · Holafly vs Saily · Holafly vs Nomad · Saily vs Nomad
The full picture
Thailand data roaming prices from US and UK carriers
Every major carrier's published Thailand 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 | — | $0.29 | 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
How much AT&T charges per hour in Thailand without a plan
Here is how the first morning in Thailand 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 Thailand?
Adjust your trip length, carrier, and data habits to see your exact savings.
Network coverage
Local carrier network data for Thailand
AT&T and Verizon connect to AIS when you roam in Thailand. An eSIM routes through the same AIS network. Your carrier routes data through AIS. So does the eSIM. The eSIM costs $0.29/GB less per day. Verizon charges $10/day for this access; Airalo charges $0.29/GB. 5G is live on AIS's network in Thailand. AT&T's roaming pass delivers that 5G signal at $10/day. A travel eSIM delivers the same 5G signal at $0.29/GB — no speed penalty for switching. Thailand has urban-only 5G coverage. 5G available in Bangkok, Chiang Mai, Pattaya, Phuket; rural areas 4G only Average download speeds reach 130 Mbps on AIS's network — identical whether you connect through a carrier roaming pass or a travel eSIM. AIS operates the widest 5G footprint in Thailand, reaching Phuket, Chiang Mai, Koh Samui, and Pattaya with consistent high-speed coverage.
AIS maintained consistent 4G signal across islands including Koh Samui and Koh Phangan. True Move H dropped in remote Koh Lipe areas.
Pricing breakdown
Thailand trip data costs by carrier and eSIM
How much does Thailand roaming cost over 14 days? AT&T: $140. Verizon: $140. T-Mobile high-speed: $210. A 10GB eSIM on AIS: $2.90. The difference between the cheapest carrier option and the eSIM is $137.10 less than AT&T.
Each day AT&T connects you to AIS in Thailand costs $10. Buy a 10GB eSIM plan at $2.90 and that same daily access drops to $0.21/day. Over 14 days, the difference is $137.10. Local 7-Eleven SIM at 299 THB ($8) offers unlimited data for 8 days — roughly 60% cheaper than most travel eSIM providers.
eSIM pricing for Thailand: 1GB at $3.49 ($3.49/GB), 3GB at $4.99 ($1.66/GB), 5GB at $6.99 ($1.40/GB), 10GB at $9.97 ($1/GB), 20GB at $15.99 ($0.80/GB). AT&T's 14-day roaming bill is $140 regardless of data consumed. Unlimited eSIM data costs $48.86 for the same period, $91.14 less. Thailand consistently offers the lowest eSIM prices in Southeast Asia, driven by fierce three-way carrier competition. Travelers in Thailand average 1.8GB of mobile data per day, so a 14-day trip needs roughly 26GB.
Trip cost breakdown
Thailand data cost scenarios: short trip to long stay
Three common trip types to Thailand and what each costs on AT&T vs a AIS eSIM:
Weekend city break (3 days, 2GB): AT&T $30 · eSIM $4.99 · saves $25.01 (83%) 2-week family vacation (14 days, 15GB): AT&T $140 · eSIM $15.99 · saves $124.01 (89%) 1-month digital nomad (30 days, 50GB): AT&T $300 · eSIM $24.69 · saves $275.31 (92%)
AT&T charges $10/day whether you use 50 MB or 5 GB that day. eSIM plans charge for a fixed data block purchased once. At no point in any of the three scenarios does carrier roaming cost less. Rates checked June 2026.
Airport options
SIM card kiosks vs eSIM at Suvarnabhumi (BKK) / Don Mueang (DMK)
Suvarnabhumi (BKK) / Don Mueang (DMK)'s SIM counters require passport scanning under Thailand's telecom regulations. Passport or ID is required for SIM registration. AIS and True Move H and DTAC handle this on-site, adding 5-10 min; counters open 24 hours to your post-flight process. A travel eSIM requires no in-country registration at point of purchase. You get 1GB on AIS for $3.49 — no passport submission needed. Local shops charge $5-15 for 10-30GB / 7-30 days with the same registration requirement.
Local alternative
Local SIM vs eSIM in Thailand
A local SIM in Thailand costs $5-15 for 10-30GB / 7-30 days at AIS and True Move H and DTAC, need a passport for registration. The in-person registration adds 5-10 min; counters open 24 hours to your arrival process. A travel eSIM at $3.49 requires no passport submission and no counter wait. Both options connect to the same AIS network.
Data planning
How to plan your data for 9 days in Thailand
One hour of video streaming consumes about 1 GB. Two hours/day of streaming in Thailand uses 2 GB daily, more than 1.8GB average usage. For a 9-day trip with occasional streaming, budget at least 17GB. Good WiFi in hotels and cafes reduces your mobile data needs.
A 20GB eSIM costs $15.99 for 9 days. AT&T charges $90 for the same trip on the same AIS towers. For heavy data users, unlimited daily plans start at $3.49/day — still cheaper than any carrier roaming pass.
Connectivity
Thailand WiFi reliability for travelers
Free WiFi in most cafes, co-working spaces, and 7-Elevens; Thailand ranks among top global WiFi speeds at 261 Mbps average Cafe WiFi networks in Thailand are open networks without encryption. They work for basic browsing, but avoid logging into banking or work apps on public networks. A travel eSIM on AIS provides a private connection for any sensitive app you use while out.
Plan your data
Thailand data allowance guide for travelers
Thailand's peak season (Nov-Feb, Jul-Aug) brings the highest flight and hotel prices — adding carrier roaming at $10/day makes it worse. A 20GB eSIM on AIS costs $15.99 for 9 days. That saves $74.01 vs AT&T, money better spent on the trip itself.
Thailand operates 3 carrier networks: AIS, DTAC, and True Move. AIS leads in 5G coverage across the country. Carrier roaming passes and travel eSIMs both land on AIS's 5G infrastructure. AT&T bills $10/day for that access. An eSIM bills $0.29/GB.
Airport SIM counters at Suvarnabhumi (BKK) / Don Mueang (DMK) charge $8-23 for unlimited data / 7-15 days after a 5-10 min; counters open 24 hours wait — still more than a 20GB eSIM at $15.99. Local prepaid SIMs in Thailand run $5-15 for 10-30GB / 7-30 days, requiring an in-person stop and sometimes a passport copy. An eSIM at $15.99 skips that entirely. Airport SIMs cost 20-30% more than 7-Eleven or carrier stores in the city
Quick reference
Thailand Travel Essentials
191/1669
191, 1669 are the emergency numbers in Thailand. 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/B/C/O
US plugs (Type A flat two-prong and Type B three-prong) fit Thailand'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)
THB (฿)
Tap-to-pay (Apple Pay, Google Pay) is accepted at most stores and restaurants in Thailand. Visa and Mastercard work at virtually all merchants. Carry a small amount of local THB for markets, taxis, and small vendors that do not have card readers.
Good to know
In Thailand, dial 191/1669 for emergency services. Calling 112 may not connect on all networks. This number works on any active SIM or eSIM, including plans with exhausted data balances.
Quick tip
WiFi availability in Thailand is rated excellent. Enabling WiFi Calling on your phone before departure lets you receive calls and texts over hotel or cafe WiFi without triggering a carrier roaming day pass.
Step by step
How to cut roaming charges on a Thailand trip
- At the airport before departure: if Settings > Cellular shows an "Add eSIM" option, your phone is ready — buy and install a Thailand plan in under 5 minutes on any airport WiFi
- Airalo offers the Thailand 1GB plan for $3.49 — buy it directly from their app or website. Compare all eSIM providers to find the best option for your trip.
- Open your phone's eSIM settings and scan the QR code — do this before your flight to Suvarnabhumi (BKK) / Don Mueang (DMK) so it activates the moment you land
- Turn off Data Roaming (Settings > Cellular on iPhone, or Connections > Mobile Networks on Android) to stop carrier charges. Read the full how-to-turn-off-data-roaming guide for device-specific steps.
- On iPhone at Suvarnabhumi (BKK) / Don Mueang (DMK): tap Settings > Cellular, select your Airalo eSIM line, and set it as the active data SIM — AIS's 5G signal appears in the status bar within 30 seconds
- On Samsung Galaxy: go to Settings > Connections > Mobile Networks > WiFi Calling and enable it on your home SIM — calls route over the eSIM data connection in Thailand
Data tips
Reducing data consumption on a Thailand trip
A VPN adds 10-20% overhead to all data usage. If you use a VPN in Thailand — for work or security on public WiFi — budget extra data. A 1 GB/hour video call becomes roughly 1.2 GB/hour through a VPN tunnel. Factor that into your plan selection if VPN use is a regular habit.
Regional context
What to know about data in Thailand
A few things to know before turning off carrier roaming in Thailand:
Thailand SIM registration: Passport required for local SIM purchase; biometric selfie verification at carrier stores. A travel eSIM purchased abroad bypasses local SIM registration requirements at the point of sale.
True and DTAC merged in 2023 — now offer identical tourist plans under both brands
Grab requires a phone number for registration; works with international numbers but local number recommended
7-Eleven stores sell prepaid SIM top-ups and are open 24/7 across the country
Thailand has some of the cheapest mobile data in the world at $0.29/GB for travel eSIMs
Free WiFi on Bangkok BTS Skytrain and MRT stations
Free WiFi in most cafes, co-working spaces, and 7-Elevens; Thailand ranks among top global WiFi speeds at 261 Mbps average Roaming passes charge $10/day to fill WiFi gaps. An eSIM covers the same connectivity at $0.29/GB.
Airport SIM counters offer instant activation with passport scan — faster than eSIM QR code setup for less tech-savvy travelers.
Cool dry season (November-February) is peak; European summer holidays bring second wave July-August
Forgot your eSIM?
Buying an eSIM after you land in Thailand: what it costs
If you reach Thailand without an eSIM, your first 30 minutes at the airport determine your data costs. Suvarnabhumi (BKK) / Don Mueang (DMK)'s arrivals area has free WiFi. Connect immediately — no queue, no counter. From there, Airalo, Holafly, Saily, and Nomad all support post-arrival eSIM purchases. The process: download the app over WiFi, choose a Thailand plan, scan the QR code, and activate. A 1GB plan on AIS costs $3.49. That is still below AT&T's International Day Pass cost for two days. If airport WiFi drops mid-install, hotel lobby WiFi provides a stable fallback for finishing the process.
Thailand FAQ
Thailand eSIM & roaming questions
How much does carrier roaming cost in Thailand?
T-Mobile includes Thailand in its free international plan, but throttles every connection to 256 Kbps — one-eighth the speed of basic 2G. AT&T costs $10/day, Verizon costs $10/day. A travel eSIM on AIS at $3.49 for 1GB provides full 5G — the same towers, none of the speed cap, and less money than either paid carrier option.
Is T-Mobile's free international data fast enough in Thailand?
No. T-Mobile caps free international data at 256 Kbps in Thailand — one-eighth the speed of basic 2G. At that rate, Google Maps takes 15+ seconds to load a single tile and will not work for navigation. Streaming video requires at least 1.5 Mbps; video calls need 2 Mbps. Basic WhatsApp text messages work, but anything else does not. T-Mobile's high-speed add-on for Thailand costs $15/day. A travel eSIM on AIS's 5G network delivers full local speeds at $0.29/GB — cheaper per GB than the speed upgrade.
How is my roaming bill calculated in Thailand?
Your carrier uses one of two models. Per-day billing: AT&T charges $10 and Verizon charges $10 for each calendar day your phone connects in Thailand — even if you only check a notification at midnight. Per-MB billing: without a day pass, AT&T charges $2.05 per megabyte, which adds up to $2,099 per GB. Both models penalize casual background data usage. A travel eSIM uses flat-rate billing — you pay 1GB for $3.49 upfront, with no per-day activations and no per-MB overages. Once purchased, the cost is fixed regardless of usage patterns.
Does my phone need to be unlocked to use a travel eSIM in Thailand?
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 Thailand. Rates checked June 2026.
How much data do TikTok and Instagram use in Thailand?
TikTok at standard quality uses 700 MB/hour of viewing. Instagram Stories and Reels use 500-800 MB/hour depending on video resolution. At $0.29/GB on AIS in Thailand, one hour of TikTok costs roughly $0.20 and one hour of Instagram Reels costs roughly $0.19. AT&T International Day Pass at $10/day covers all social media but applies the full daily fee regardless of how little you use. For travelers who browse social apps 30-60 minutes per day, the eSIM still costs less than one AT&T day fee. Rates checked June 2026.
Which US carrier has the best roaming deal for Thailand?
None of the three US carriers offer a genuinely good deal in Thailand. 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 AIS starts at $0.29/GB — a 7-day trip at average usage costs $3.05 versus $70 for AT&T. No carrier matches the eSIM on per-GB cost.
How much does a week of data in Thailand cost with each US carrier?
AT&T International Day Pass: $70 for 7 days. Verizon TravelPass: $70. T-Mobile high-speed add-on: $105. T-Mobile free tier: $0 but throttled to 256 Kbps (not usable). A travel eSIM on AIS: roughly $3.05 for 7 days at 1.5 GB/day average usage. The eSIM is 80-90% cheaper than any paid carrier option.
Do local apps in Thailand require a local SIM or does an eSIM work?
Most local apps in Thailand — 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 $0.29/GB on AIS'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 Thailand?
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 — Thailand may be included in a regional plan, or you may need a Thailand-specific plan plus a regional one.
How much does carrier roaming cost for a week in Thailand?
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 Thailand starts at $0.29/GB on AIS's 5G network — better per-GB value than all three carriers.
Fact check
Common myths about roaming and eSIM in Thailand
A VPN eliminates roaming costs
A VPN changes the routing of your data packets — it does not change which cellular network your phone connects to. In Thailand, your phone attaches to AIS's towers whether or not a VPN is active. AT&T still bills $10/day for that connection even when you tunnel traffic through a VPN server. A VPN also adds 10–20% overhead to your total data consumption on top of the carrier charge.
eSIMs use different, slower networks
A travel eSIM in Thailand connects to the same AIS towers as AT&T and Verizon roaming. The radio frequency bands, signal strength, and 5G speed are identical. AT&T's roaming agreement with AIS and a travel eSIM provider's agreement with AIS both access the same physical infrastructure. No speed penalty exists for switching from roaming to eSIM.
eSIM drains more battery than a physical SIM
An eSIM is a programmable chip embedded in your phone's hardware — the same radio module that handles physical SIM cards. It draws no additional power beyond what a physical SIM uses. Battery drain in Thailand is driven by signal strength and data activity, not by SIM format. Weak signal forces your radio to search harder — that is the actual drain variable regardless of SIM type.
Our recommendation
Thailand eSIM recommendation
The numbers point to Holafly for Thailand. Holafly's unlimited plan runs on AIS in Thailand at $3.49/day with no data cap. For trips longer than 5 days, unlimited data removes the guesswork of picking the right GB tier. Streaming, video calls, and tethering all work without watching a usage meter. Airalo is the pick if you use less than 2 GB/day — a 1GB plan at $3.49 costs less for light users.
7 days in Thailand: $70 difference between carrier roaming and eSIM
eSIM data in Thailand starts from $0.29. AT&T roaming starts from $10/day.
Get a Thailand eSIM