Directory · Mobile & SIMMobile networks & SIM plans in Thailand.
Getting connected on your phone in Thailand — tourist SIMs vs. resident plans, eSIM, and how to avoid overpaying or losing your number.
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01What this is & why you'd need it
A working Thai mobile number and data plan is one of the first things every foreigner needs — it powers maps, ride apps, banking OTPs, food delivery and messaging. Thailand has three main networks plus resellers, offering short-term tourist SIMs, monthly prepaid top-ups, postpaid contracts and eSIM. New arrivals waste money by buying an airport tourist SIM and never switching, or lose access when a number tied to their bank app lapses. Choosing the right plan and registering it correctly to your passport keeps you connected and keeps your OTP-dependent accounts working.
02What to look for
- Coverage where you'll actually live and travel — not just the airport (networks differ by region and island)
- Tourist SIM vs. local prepaid/postpaid: tourist SIMs are convenient but pricier per GB for long stays
- eSIM support if your phone has it — quick to activate, easy to keep a home-country number alongside
- Whether the number can be registered to your passport and kept long-term (important for bank-app OTPs)
03Questions to ask before you commit
Q. Is this a short tourist SIM or a plan I can keep and top up indefinitely?
Q. What's the real cost per month for the data I use, not the headline promo price?
Q. Is the SIM registered to my passport so I keep the number — and so my bank's OTP keeps working?
Q. What's the coverage like in the specific area and islands I'm moving to?
Red flags
Walk away if you see…
- An unregistered SIM sold off the books — it can be cut off, and Thai law requires SIM registration to ID
- Pushing an expensive 30-day tourist package to someone clearly staying for months
- A number you can't easily keep or top up, which then breaks bank and app logins tied to it
- Postpaid contracts with lock-in and exit fees that aren't explained up front
What it typically costs
Tourist SIMs are priced for convenience over short windows; local prepaid top-ups and postpaid plans are far cheaper per GB for long-stayers. eSIM data packs sit in between. Treat the airport SIM as a first-week bridge, then move to a local plan and compare the true monthly cost for your actual data use.
Frequently asked
Should I just keep my airport tourist SIM?Only for the first week or two. Airport and tourist SIMs are built for convenience and are expensive per GB over months. Once you're settled, switch to a local prepaid top-up or postpaid plan registered to your passport — it's cheaper and gives you a stable number you can keep.
Which network is best?It depends entirely on where you live and travel — coverage and speed vary by neighbourhood, province and island, so the 'best' network for a Bangkok condo may not be best for a Koh Samui villa. Ask other expats in your specific area, and don't commit to a long postpaid contract until you've tested the signal where you actually are.
Why does my SIM matter for banking?Thai banking and many apps send one-time passcodes (OTPs) by SMS to your registered number. If that number is a tourist SIM that lapses, or isn't properly registered to you, you can lose access to your bank app and other logins. Use a number you can keep long-term and register it to your passport.
Find the home to match
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General information only — not legal, financial, medical or tax advice. We never take paid placement. Verify any provider's credentials, fees and terms directly before committing.