The best eSIM for Thailand depends on how much data you need, but for a typical trip eSIM Ahora offers plans from $1.20, activated by QR code in about 30 seconds with no roaming from your home carrier. A 3 GB, 30-day plan costs $4.50. You connect, with top-ups available and nationwide coverage. Compatible with iPhone XS or newer, Samsung Galaxy S21+ and Google Pixel 3+.
Full-speed data every day; after the daily cap the speed is reduced.
Full speed up to 500 MB/day, then 512 Kbps.
Every eSIM can be installed within 180 days of purchase. Plan validity starts when you first connect.
Your eSIM picks between the networks your plan includes. The ones marked "plan-dependent" are only on some plans.
Thailand has three main carriers: AIS (Advanced Info Service, best nationwide coverage with broad 5G), TrueMove H (5G in Bangkok, Phuket, Pattaya, Chiang Mai), and dtac (Total Access Communication, good urban coverage). Plugs are a mix of Types A, B, C, and F — most accept both European and American formats. 220V. On the BTS Skytrain and MRT in Bangkok there's 4G/5G at all stations and tunnels.
Bangkok Suvarnabhumi Airport (BKK) offers 2 hours free WiFi; Don Mueang (DMK, low-cost) and Phuket (HKT) too. The currency is the Thai baht (THB); use Bangkok Bank, Kasikorn Bank, or Siam Commercial Bank ATMs — AEON Bank ATMs have lower commissions (220 THB vs 350 THB at others). Grab and Bolt apps are the safest taxi option. Watch out for tourist traps near the Grand Palace: taxis offering closed tours or drivers saying "the temple is closed." Tips are 10% at tourist restaurants.
The dry, cool season runs November to February — best for Bangkok, Chiang Mai, and the southern islands. March-May is brutally hot, especially in Bangkok where it tops 40°C. The rainy season (June-October) brings monsoons, but storms are brief and prices drop 30-40%. Songkran (water festival, April 13-15) is loud and wet — pure fun, but not for carrying electronics outside.
AIS, TrueMove, and dtac deliver solid 4G/5G in Bangkok, Chiang Mai, Phuket, and the larger islands (Samui, Phi Phi). Smaller islands like Koh Lipe or parts of Koh Tao have limited signal — most hotels make up for it with free Wi-Fi. Bangkok's BTS and MRT have Wi-Fi and steady mobile coverage. In the mountainous north (Pai, Mae Hong Son) signal fades on winding roads.
Thailand uses Type A/B/C plugs (220V, 50Hz) — some outlets accept both European and American formats. Basic English works in tourist zones, and apps like Grab (Asia's Uber) wipe out the language barrier for transport. Tipping isn't required but appreciated — round up or leave 20-50 baht. Beware of "special offers" from taxis near temples (Grand Palace): many are scams to take you to shops.
Thai physical SIMs are cheap (300-500 baht for a week of unlimited data), but require visiting a shop and registering with passport. The eSIM skips the queue at Suvarnabhumi airport and gives you internet the moment you land. For a Bangkok-Chiang Mai-Krabi loop, 15 GB for 10 days is comfortable — you'll use Grab and maps constantly.