4G & 5G Coverage in Thailand: What to Expect
eSIM from 1,00 USD · 100 MB. Networks: AIS (5G), True Move (4G), TrueMove H (5G).
Real-world coverage in Thailand
4G coverage is generally good in cities and major roads. 5G is expanding — available in some capital cities and tech hubs. In practice, most travel eSIMs use 4G/LTE.
Known problem areas
- Jungle trekking routes in Doi Inthanon and Khao Yai parks
- Boat trips between the Koh Samui island chain
- Limestone karst areas in Phang Nga Bay
- Underground temples and cave shrines
Coverage by city
- Bangkok: Excellent coverage; BTS and MRT now have 4G/5G on elevated sections.
- Phuket: Resort areas well-covered; remote southern beaches thinner.
- Chiang Mai: Good 4G in old city; villages on mountain roads need offline maps.
- Pattaya: Beach resort; solid coverage on Walking Street and coastal road.
- Koh Samui: Good coverage; ferry to Koh Phangan loses mid-crossing.
- Krabi: Main town good; longtail to islands can lose signal.
Tip: if you're visiting rural areas or national parks, download offline maps and don't count on permanent signal.