Here are the Top 5 cheapest unlimited SIM card options in Thailand (2026) — based on real current plans, pricing, and what actually works for foreigners living or traveling in Bangkok/Isaan.
I’ll break down:
- Price (real monthly cost)
- Speed (VERY important in Thailand)
- Features (calls, apps, etc.)
- Where to buy (exact places)
TOP 5 CHEAPEST UNLIMITED SIM CARDS (2026)
🥇 1. DTAC “Go Unlimited” (Cheapest True Unlimited)
Provider: DTAC
💰 Price: ~299–399 THB/month
📶 Speed: 4–10 Mbps (speed capped)
📡 Type: True unlimited data
⭐ Features:
- Unlimited internet (no data cap)
- Enough speed for YouTube, maps, LINE
- Some plans include free social apps
📍 Where to buy:
- 7-Eleven
- DTAC Shop
- Shopee / Lazada
👉 Best overall CHEAPEST unlimited plan in Thailand
🥈 2. TrueMove H Unlimited (Best Value + Speed)
Provider: TrueMove H
💰 Price: ~300–699 THB/month
📶 Speed: 6–15 Mbps
⭐ Features:
- Faster than DTAC at similar price
- Free calls included (some plans)
- Strong city coverage
📍 Where to buy:
- True Shop
- 7-Eleven
👉 Best balance of price + performance
🥉 3. AIS Unlimited 10 Mbps (Best Reliability)
Provider: AIS
💰 Price: ~450–500 THB/month
📶 Speed: Stable 10 Mbps
⭐ Features:
- Strongest nationwide coverage
- Works best in rural areas (Isaan)
- Reliable connection
📍 Where to buy:
- AIS Shop
- Shopping malls (Central, Terminal 21)
👉 Best for living outside Bangkok
🏅 4. True “God SIM” (Cheapest long-term hack)
Provider: TrueMove H
💰 Price: ~2,000–4,000 THB/year
👉 (~170–330 THB/month equivalent)
📶 Speed: 6–15 Mbps
⭐ Features:
- Prepaid annual SIM
- Unlimited data
- Often includes free calls
📍 Where to buy:
- Lazada / Shopee
- True stores (limited availability)
👉 Cheapest long-term unlimited option in Thailand
🏅 5. Full-Speed Unlimited 5G Plans (No speed cap)
Providers: AIS / TrueMove H
💰 Price: ~899–1,299 THB/month
📶 Speed: MAX 5G (no limit)
⭐ Features:
- True unlimited (no throttling)
- Best for:
- Streaming HD/4K
- Gaming
- Hotspot use
📍 Where to buy:
- Official carrier shops
- Malls
👉 Only option if you want real unlimited full speed
📊 SIM CARD COMPARISON (2026)
| Plan | Price | Speed | True Unlimited | Best For |
|---|---|---|---|---|
| DTAC Go Unlimited | 299–399 | 4–10 Mbps | ✅ | Cheapest |
| TrueMove Unlimited | 300–699 | 6–15 Mbps | ✅ | Best value |
| AIS 10 Mbps | ~482 | 10 Mbps | ✅ | Rural reliability |
| True God SIM | ~170–330/mo | 6–15 Mbps | ✅ | Long-term cheapest |
| Full Speed 5G | 899–1299 | Max speed | ✅ | Heavy users |
⚠️ VERY IMPORTANT (Most People Get This Wrong)
“Unlimited” in Thailand = 3 types:
- ✅ Cheap unlimited → speed capped (MOST COMMON)
- ⚠️ Hybrid → high-speed limit, then slow
- 💰 True unlimited → expensive
👉 Most people should choose speed-limited unlimited (6–15 Mbps)
It’s fast enough for:
- YouTube
- Google Maps
- Video calls
📍 Where to Buy SIM Cards (Best Places)
Cheapest:
- 7-Eleven (everywhere)
Best service/help:
- AIS Shop
- True Shop
- DTAC Shop
💡 SIM cost: ~49–99 THB
🧠 Insider Tips (2026)
- ❌ Avoid airport SIMs → 2–3x more expensive
- ✅ Buy cheap SIM + activate plan in app
- Apps to use:
- MyAIS
- True iService
- DTAC app
- 📶 If you’re in Isaan:
👉 Choose AIS (better coverage)
🏁 FINAL RECOMMENDATION
👉 Best cheap overall: DTAC 299 THB plan
👉 Best balance: TrueMove 6–15 Mbps
👉 Best rural use: AIS
👉 Best long-term: True God SIM