Thailand is having a moment with Irish travellers. Whether you're fresh out of the Leaving Cert, just wrapped up college, or finally taking that long-haul trip you've been putting off, two weeks in Bangkok, the islands, and Chiang Mai is absolutely worth it. But before you land, there's one thing worth sorting that most people leave until the last minute: how you're actually going to stay online.
The SIM Queue at Bangkok Airport Is Not the Vibe You Want
Suvarnabhumi Airport in Bangkok has SIM card kiosks, and yes, they work. But after a 12-hour flight from Dublin — usually with a connection in the Middle East or somewhere in Europe — the last thing you want is to be standing in a queue, jetlagged, trying to decipher which prepaid plan covers both data and calls, paying in a currency you haven't figured out yet, and hoping the staff speak enough English to explain why the SIM isn't activating on your phone.
Phuket Airport is smaller, and the options are even more limited. If you're heading straight to Koh Samui via a domestic connection, you might land with no data at all and no easy way to sort it until you're already at your hotel.
The smarter move is to have everything sorted before you leave Dublin.
eSIM Thailand — What the Coverage Actually Looks Like
A quality eSIM for Thailand runs on networks like AIS, DTAC (now True Move H), or a combination — and coverage across the main tourist areas is genuinely solid.
Bangkok has excellent 4G/LTE coverage throughout the city, including on the BTS Skytrain, in malls, and across most of the street-food areas you'll be wandering at midnight. Chiang Mai is well-covered in the city centre and the surrounding areas you're likely to visit — 4G is reliable in the Old City and most of the road up toward Doi Inthanon.
Koh Samui has good coverage in the main tourist zones — Chaweng, Lamai, and around the ferry terminals. It can drop off a bit in more rural parts of the island, but nothing that'll ruin your trip. Koh Tao is more remote, and coverage is patchier — 3G in some spots, no signal if you hike deep into the hills. That's just the reality of a small island, and no SIM solution is going to fix that. But for WhatsApp, Google Maps, and Instagram, you'll be absolutely fine in the main areas.
💡 Most eSIM plans for Thailand offer between 10GB and 30GB for a two-week trip — that's plenty for navigation, streaming music, and the odd video call home, even with a few beach days thrown in.
The Dual SIM Advantage — Keep Your Irish Number Active
Here's something a lot of people don't think about until it bites them: your Irish bank will almost certainly send a 2FA (two-factor authentication) code to your Irish mobile number when you try to log in abroad. If you've swapped out your physical SIM for a Thai one, you won't receive that text, and you'll be locked out of your account while you're trying to pay for a tour or transfer money.
This is where eSIM genuinely earns its keep. Most modern iPhones (from XS onwards) and a wide range of Android phones support dual SIM — one physical SIM, one eSIM. You keep your Irish Three, Vodafone, or Eir SIM in the phone as normal, and you add the Thai eSIM on top of it. Your Irish number stays active for calls and texts (including bank codes), while all your data usage routes through the Thai plan.
No swapping, no losing a tiny SIM card in your backpack, no drama.
Getting Set Up Before You Fly
The process is straightforward:
- Check that your phone is eSIM-compatible and unlocked — most phones bought in Ireland in the last four or five years are fine, but worth confirming.
- Browse plans for Thailand and pick one that covers your trip length and data needs.
- Purchase the eSIM and download it to your phone — you'll get a QR code to scan, and it takes about two minutes.
- Set your data routing so the Thai eSIM is used for mobile data while your Irish SIM handles calls and texts.
- When your plane lands in Bangkok, switch on data roaming for the Thai eSIM and you're connected before you've even reached baggage claim.
That's it. No queues, no kiosks, no guesswork.
Thailand is an incredible trip and it deserves a smooth start. Getting your data sorted in advance is one of those small things that makes a real difference — especially on day one when you're trying to find your hotel, figure out the BTS, and get a bowl of pad thai in front of you as quickly as possible.
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