Roaming, Local SIM or eSIM for Thailand?
eSIM from 1,00 USD · 100 MB. Networks: AIS (5G), DTAC (5G), True Move (4G), TrueMove H (5G).
Roaming, Local SIM or eSIM for Thailand: honest comparison
| Roaming | Local SIM | eSIM | |
|---|---|---|---|
| Activation time | 0 min (automatic) | 15–60 min (shop + registration) | 5–10 min (online) |
| Cost | Variable: free (EU), very expensive outside | Low, but single country only | Fixed and predictable |
| Keep your number | Yes | No (new number) | Yes (dual SIM) |
| Multi-country | Yes (if your plan covers it) | No (1 country = 1 SIM) | Yes (regional plans) |
| Bill shock risk | High (unexpected charges) | Low | Low (prepaid) |
When does each option make sense?
- Roaming: if your carrier includes Thailand at no extra cost (rare outside the EU).
- Local SIM: if you're staying a month or more and need a local number for calls and SMS.
- eSIM: for most travellers — configure before departure, fixed price, keep your main number for WhatsApp and 2FA.
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)
Thailand 500MB/Day
500 MB · 1 días · 1,50 USD
Thailand 100MB 7Days
100 MB · 7 días · 1,00 USD
Thailand 3GB 15Days
3 GB · 15 días · 3,00 USD
Thailand 3GB 30Days
3 GB · 30 días · 3,00 USD
Examples from our database — availability and pricing can change.