Are Unlimited Thailand eSIMs a scam? The truth.
Last updated: July 19, 2026
Most "unlimited" Thailand eSIMs are not truly unlimited. After 1–5 GB per day (or 15–60 GB per validity period for the more generous providers), speeds often drop to anywhere between 128 Kbps and 2 Mbps under a Fair Usage Policy. Here's exactly what happens after the throttle kicks in, and which providers are upfront about it.
💡 Did you know? What "throttled speed" actually means for your phone
Throttled speeds are listed in megabits per second (Mbps), but your phone measures downloads in megabytes (MB). There are 8 bits in a byte, so the actual download speed is 8× slower than the number suggests. Here's what that means in real life:
| Throttled speed | Actual download rate | Time to download 1 photo (3 MB) | Time to load a web page (2 MB) |
|---|---|---|---|
| 128 Kbps | 16 KB/s | ~3 minutes | ~2 minutes |
| 512 Kbps | 64 KB/s | ~47 seconds | ~31 seconds |
| 1 Mbps | 125 KB/s | ~24 seconds | ~16 seconds |
| 2 Mbps | 250 KB/s | ~12 seconds | ~8 seconds |
For context: 128 Kbps is slower than a 1990s dial-up modem. 2 Mbps is roughly equivalent to early-4G speeds: usable for messaging, maps, and basic browsing, but painful for video calls and uploads. The throttled speed your provider drops you to determines whether "unlimited" still feels like internet.
What "unlimited" actually means
Most "unlimited" Thailand eSIMs work roughly like this:
- You get a high-speed allowance — usually a daily cap (1–5 GB/day) or a total cap that scales with the plan length (15–60 GB across the validity period).
- Once you hit that cap, your speed drops — anywhere from 128 Kbps (barely functional) to 2 Mbps (slow but usable), depending on the provider.
- The speed resets daily or at the end of the plan — daily-capped plans reset around midnight local time. Validity-period plans don't reset within the plan; once you've hit the cap you're throttled until the plan expires.
The data itself doesn't cut off. You can technically still use the internet. That's the "unlimited" part. But the usable part, the high-speed data you actually need for maps, photos, and video calls, is very much limited.
There's another catch that trips people up: with most unlimited plans, you can't buy your way out of the throttle. Hit your daily cap at 11 AM? There's no top-up option, no "add more high-speed data" button. You're stuck at crawl speed until the next day. With a fixed data plan, you can always top up when you need more, on your terms, not on a daily timer.
This is what providers call a Fair Usage Policy (FUP). It's standard across the industry, and it's not inherently dishonest; networks need to manage capacity. The problem is that the word "unlimited" is plastered across the marketing while the FUP is tucked away in a footnote.
What popular providers actually deliver
We went through the fine print of the major eSIM providers selling "unlimited" Thailand plans. Here's what we found:
| Provider | High-speed cap | Speed after cap | Disclosed upfront? |
|---|---|---|---|
| Nomad | 2 GB/day | 512 Kbps | ✓ Documented in plan details |
| Saily | 5 GB/day | ~1 Mbps (1024 Kbps) | ✓ 5 GB/day, then ~1 Mbps |
| Ubigi | 15–60 GB total (varies by plan length) | 2 Mbps | ✓ Tiered cap by validity, fully documented |
| Airalo | 3 GB/day | ~1 Mbps (1024 Kbps) | ✓ 3 GB/day, then ~1 Mbps |
| Holafly | ~90 GB/month soft cap | 256–1024 Kbps | ⚠️ Soft cap only; daily threshold not published |
| MicroEsim | Varies widely by plan tier | 124 Kbps to 5 Mbps (depending on tier) | ⚠️ Many sub-plans, hard to compare |
| Simify | Not specified | Won't drop below 1 Mbps; resets at midnight | ⚠️ Speed floor disclosed, threshold isn't |
Sources: each provider's published plan details and FUP documentation, checked May 2026. Nomad's 2 GB/day cap is documented in their plan detail page and confirmed in their unlimited eSIM blog post. Ubigi's tiered FUP is documented on their Thailand unlimited product page.
The spread here is wider than you might expect. Ubigi is the most generous: a 30-day plan gives you 60 GB before throttling, then drops to 2 Mbps, which is still usable for maps and messaging. At the other end, Holafly only references a ~90 GB/month soft cap and a 256–1024 Kbps throttle, without publishing an exact daily threshold — the kind of fine print that catches you off guard on a boat to Koh Phi Phi. Nomad has the strictest cap (2 GB/day) and one of the slowest throttles (512 Kbps), but they're upfront about both numbers, which is more than most. Airalo now sells unlimited Thailand plans too (3–30 days, $9.50–$49) on AIS and TrueMove H, with a transparent 3 GB/day high-speed cap that then throttles to about 1 Mbps — the same throttled speed as Saily, just with a lower daily allowance. For a full head-to-head breakdown, see our Travelsim Asia vs Airalo 2026 comparison.
⚠️ 3 signs your "unlimited" plan is a trap
- The price is under $30 for 30 days. High-speed Thai data costs money. True unlimited at that price doesn't exist for tourists; the low price works because you'll be throttled to near-unusable speeds within hours of heavy use.
- "FUP" appears anywhere in the terms. Fair Usage Policy is the legal mechanism that lets providers slow you down. If you see it, even in a footer footnote, your speed will be capped. The question is just how strict and how transparent.
- There's no top-up option. If you can't buy extra high-speed data when you hit the cap, that's a deliberate design choice. Fixed plans almost always let you top up on demand.
What throttled speed actually feels like in Thailand
Speed numbers don't mean much in the abstract. Here's what they feel like when you're trying to use your phone in Bangkok or Chiang Mai:
128 Kbps
Slower than 2G. WhatsApp texts take seconds to send. Images don't load. Google Maps can't render tiles. Forget uploading anything. This is barely functional.
512 Kbps
WhatsApp works for text. Images load slowly. Google Maps functions but takes 10–20 seconds to update. Photo uploads take minutes per image. No video calls.
1 Mbps
Basic browsing works. Maps load. WhatsApp images go through. But video calls stutter, Instagram scrolling is painful, and uploading photos of that Pad Thai takes ages.
2 Mbps
Comparable to early-4G. Maps and messaging work normally. Standard-def YouTube and Spotify stream OK. Photo uploads take 10–15 seconds each. HD video calls may stutter but still connect.
For context, full 4G in Thailand typically runs at 30–80 Mbps. Getting throttled to 512 Kbps means your connection just dropped to less than 1% of normal speed. Even at 2 Mbps, the most generous throttled speed in this comparison, you're at roughly 3–6% of normal. You're technically "connected," but the experience is a different thing entirely.
Why is my Holafly or Nomad eSIM so slow in Thailand?
If you're already in Thailand and your eSIM has slowed to a crawl, the answer is almost certainly not a signal problem. Thailand has excellent 4G and 5G coverage across Bangkok, Chiang Mai, Phuket, and most tourist areas. If your eSIM was working fine this morning and is now barely loading a map, you've hit the FUP throttle.
- Nomad Thailand unlimited: 2 GB cap before dropping to 512 Kbps, one of the strictest throttles in the market. Heavy morning use will leave you barely connected by lunchtime.
- Saily Thailand unlimited: 5 GB/day before throttling. The cap is more generous than Nomad's, and after it Saily throttles to about 1 Mbps — fine for maps and messaging, slow for video calls and uploads.
- Holafly Thailand: References a ~90 GB/month soft cap and throttling to 256–1024 Kbps, but doesn't publish an exact daily threshold. Users report throttling kicking in during mid-afternoon on heavy-use days. Once throttled, you wait for the daily reset.
- Airalo Thailand unlimited: 3 GB/day at full speed, then throttled to about 1 Mbps for the rest of the day. That's a more usable throttled speed than Nomad's 512 Kbps, but a stricter daily cap than Saily's 5 GB/day.
- Ubigi Thailand unlimited: Cap depends on plan length — 15–25 GB on a 7-day plan, 60 GB on a 30-day plan. Once exceeded, drops to 2 Mbps for the remainder of the plan (no daily reset). Most travelers won't hit this.
If you're currently throttled and need a fix right now, the only real options are to find a café with WiFi, wait for the daily reset (usually midnight local time), or switch to a different SIM. This is exactly why we sell fixed data plans with no throttle. If you run low, you top up and get full speed immediately. No timers, no reset windows.
Looking for a replacement? Our 10 GB Thailand plan gives you full 4G/5G speed for the entire validity period, with no daily cap and no throttling. Buy in minutes, eSIM to your email, activate and you're back online at full speed.
When does the throttle actually kick in?
2–3 GB per day sounds like plenty until you look at what eats through it:
| Activity | Approx. data used |
|---|---|
| Google Maps navigation (1 hour) | ~10–20 MB |
| WhatsApp messaging (all day, text + some images) | ~50–150 MB |
| Instagram browsing (30 minutes) | ~250–400 MB |
| Uploading 20 photos to social media | ~200–500 MB |
| Video call (30 minutes) | ~300–700 MB |
| Netflix/YouTube (1 hour, HD) | ~1.5–3 GB |
| Hotspotting to a laptop (1 hour, normal use) | ~500 MB–1 GB |
A single video call plus some Instagram browsing and photo uploads can push you past 2 GB before lunch, well past Nomad's 2 GB daily cap. Saily's 5 GB/day is harder to blow through casually, and Ubigi's plan-length-based caps are the most forgiving. Not sure how much data you actually need for your trip? We break it down by usage type in our Thailand eSIM data usage guide.
The worst-case scenario
It's 2 PM. You burned through your daily cap uploading temple photos in the morning. Now you're in a tuk-tuk heading to a restaurant you bookmarked, but Google Maps is stuck loading. You can't pull up the address, can't message the group chat, and can't check if the restaurant is even open. Your eSIM says "unlimited." Your phone says otherwise. Your speed won't reset until tomorrow, which doesn't help you now.
The math: unlimited vs fixed
Here's a typical "unlimited" plan next to a fixed data plan for a 7-day Thailand trip.
"Unlimited" plan (typical)
- 2–5 GB/day at full speed
- Throttled after that, anywhere from 128 Kbps to 2 Mbps
- 7 days = 14–35 GB usable at speed
- Typically $15–$30 for 7 days
- Throttled hours = frustrating hours
Fixed plan (e.g. 5 GB / 30 days)
- 5 GB at full speed, all day, every day
- No throttling — ever
- Use it when you need it, not on a daily clock
- Typically $8–$12
- Top up if you need more
Most travelers use 500 MB–1.5 GB per day. On a fixed 5 GB plan, that comfortably covers a full week without throttling. You get full speed every time you open your phone, not just for the first 2 GB of the day.
Why we don't sell unlimited plans
We could. Plenty of providers do. But we'd rather sell you a plan that does what it says.
When you buy a 5 GB plan from Travelsim Asia, you get 5 GB. At full speed. No daily caps, no throttling, no Fair Usage Policy fine print. If you use 3 GB on Monday and 200 MB on Tuesday, that's fine. The data is yours to use however you want, whenever you want.
- Full speed, all the time — no throttling, no daily caps.
- Top up if you need more — through a web portal, no login required.
- No app, no account — buy on the website, eSIM arrives by email.
- What you see is what you get — the plan says 5 GB, you get 5 GB.
When unlimited does make sense
We're not here to say unlimited is always bad. It can work well in specific situations:
- You genuinely don't want to think about data at all — and you're okay with slow speeds in the evening if you used a lot in the morning.
- You consistently stay under 2 GB/day — in which case you'll rarely hit the throttle, and unlimited gives you peace of mind.
- You want a generous, transparent FUP and you're willing to pay for it — Ubigi's 30-day plan gives you 60 GB before throttling to 2 Mbps. That's the closest thing to "real" unlimited in this market, and it costs roughly 4× the price of a comparable fixed plan.
- You're on a very long trip — and the psychological comfort of "unlimited" outweighs the cost difference. Planning a month-long stay specifically? See our best eSIM for Thailand 1 month guide for plan recommendations tailored to 30-day trips.
Unlimited plans aren't a scam. But the word "unlimited" sets an expectation the product doesn't fully deliver. If you go in with eyes open and understand the daily cap, it can be a reasonable choice. If you're expecting full-speed internet all day every day, you'll be disappointed.
What to check before buying any Thailand eSIM
Whether you go unlimited or fixed, here's what to look for. If you'd rather skip straight to a ranked shortlist, see our best eSIM for Thailand guide.
- Look for "Fair Usage Policy" or "FUP" — if you see these terms, the plan has a daily speed cap. Read what happens after you hit it.
- Check the throttled speed — 1 Mbps is livable. 512 Kbps is rough. 128 Kbps is unusable for anything beyond basic text. 2 Mbps (Ubigi's floor) is the most generous you'll find.
- Check whether the cap is daily or per-plan — a 5 GB/day cap resets every midnight. A 60 GB/30-day cap doesn't reset within the plan, but it's more forgiving for travelers with uneven usage patterns.
- Check hotspot restrictions — some "unlimited" plans cap hotspot usage separately.
- Compare the actual cost per usable GB — an unlimited plan with a 2 GB daily cap gives you 14 GB of usable speed per week. Compare that to the cost of a 10 GB fixed plan.
- Check if the provider discloses terms upfront — if you have to dig through a FAQ to find the FUP, that tells you something about how they market their product.
- Ask: can I top up if I hit the cap? — most unlimited plans don't let you buy extra high-speed data mid-day. Fixed plans almost always allow top-ups on demand.
The verdict
Are unlimited Thailand eSIMs a scam? No. The data is real, the connection works, and some providers (Nomad and Ubigi) are transparent about how it all functions. Nobody is stealing your money.
Are they a trap? For most travelers, yes. The word "unlimited" sets an expectation that most plans don't deliver: full-speed internet all day every day. What you actually get is 1–5 GB at full speed, then a throttle that ranges from "barely usable" (128 Kbps) to "actually fine" (2 Mbps), depending on the provider. That gap between expectation and reality, by design, is the trap. Going in with eyes open is the difference between a smart purchase and a frustrating one.
Need help choosing? Our support team is available 24/7 via email and live chat. Typical response time: under 1 hour. Already purchased? Follow our Thailand eSIM installation guide to get set up in minutes.
Dig deeper
Need more detail on a specific topic? We've covered the Thailand eSIM decision from every angle:
- Best eSIM for Thailand (2026) — full comparison of Airalo, Holafly, Nomad, Saily, Ubigi, and Travelsim Asia on coverage, throttling, and setup.
- Best eSIM for Thailand — 1 Month Stay — dedicated guide for travelers planning 30-day trips, focused on the best value plans for monthly usage patterns.
- Thailand eSIM Prices 2026 — every major provider's plans and prices side by side, with validity windows and hidden trade-offs explained.
- How to Install a Thailand eSIM — step-by-step setup for iPhone and Android, activation at Suvarnabhumi and Don Mueang, and troubleshooting.