AIS in Thailand: Coverage & Tips for Travellers

eSIM from 1,00 USD · 100 MB. Networks: AIS (5G), DTAC (5G), True Move (4G), TrueMove H (5G).

AIS in Thailand

Best for: Best overall coverage nationwide

What to know

• Dominant network; best in islands and northern mountains
• Good choice for Chiang Mai and remote treks

Areas where signal can drop

• 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

Other carriers in Thailand

• TrueMove H : Urban 5G speeds
• DTAC : Value and roaming

If you have no signal (quick troubleshooting)

1. Aeroplane mode for 10 s → disable.
2. Confirm the eSIM line is set as "Mobile Data".
3. Restart your phone.
4. Settings → Network → Manual network selection → choose AIS.
5. If nothing works: check the APN (sometimes needs manual configuration).

Quick checklist: stay online without surprises

The make-or-break moment is often the first 30 minutes after landing: maps, transport, messages. Install your eSIM on Wi‑Fi before you travel and switch mobile data to the eSIM when you arrive. That way you're not dependent on airport Wi‑Fi and you avoid accidental roaming charges.

For typical use (maps + messaging + light social media), 1–3 GB per week is often enough. If you tether for a laptop, take video calls, or stream daily, aim for 10 GB+ or a plan with fair-use throttling instead of a hard cut-off.

• Networks: AIS (5G), DTAC (5G), True Move (4G), TrueMove H (5G)
• Offline maps: download the area in Google Maps while you're on hotel Wi‑Fi.
• On the move: Grab, Bolt, local tuk-tuk apps + LINE, WhatsApp work well on low data — video and app updates are usually the real data drains.
• Common weak spots: Jungle trekking routes in Doi Inthanon and Khao Yai parks · Boat trips between the Koh Samui island chain
• City context: Bangkok: Excellent coverage; BTS and MRT now have 4G/5G on elevated sections. · Phuket: Resort areas well-covered; remote southern beaches thinner.

Phone setup tip: keep your primary SIM active for calls/SMS (so 2FA codes can arrive), but turn off mobile data on that line. Set the eSIM as your data line — it prevents accidental roaming on the wrong SIM and keeps WhatsApp/banking flows more predictable.

Current eSIM plans (examples)

Examples from our database — availability and pricing can change.