Thailand eSIM

eSIM Thailand: FAQ

• 1Which eSIM for Thailand – and why not just the tourist SIM at the airport?

  A Thailand travel eSIM is bought online before you leave, installed at home on Wi‑Fi and online as soon as you land in Bangkok, Phuket or Krabi – no queue at the airport counter after a long flight. A Thai SIM card, by contrast, requires in-person registration with your passport, and the regulator NBTC tightened identity checks in 2025 and 2026. The MonoEsim eSIM uses a Thai partner network, and your own SIM stays in the phone for bank texts. Thailand is outside the EU, so home roaming is charged extra.

• 2Tourist SIM, eSIM or roaming: which is better for Thailand?

  Roaming is easiest but usually expensive outside the EU. Tourist SIMs are sold at airport counters and shops against your passport, registration is in person, and foreigners may register at most three SIMs per operator; you do get a Thai number. The MonoEsim eSIM is ready before departure, skips the queue and keeps your home number in the phone. The trade-off: it is data-only – for most travellers WhatsApp, LINE and Grab over data are enough.

• 3Which networks are there in Thailand, and is there 5G?

  Thailand has three operators: AIS, True (which merged with dtac in 2023) and state-owned NT. 4G is very good in cities, at the beaches and on the well-known islands; 5G is available in Bangkok and many tourist areas. The plan details show which partner networks a pack uses and whether 5G is included.

• 4How many GB do I need for 2, 3 or 4 weeks in Thailand?

  As a guide, 10 GB usually covers two weeks of maps, Grab, messengers and social media. For three to four weeks (around 30 days) between Bangkok, Chiang Mai and the islands, plan 15–20 GB, more with lots of video, cloud backups or hotspot use, or an unlimited plan where offered.

• 5Is there signal on Phuket, Koh Samui and the smaller islands?

  Bangkok, Chiang Mai and well-known islands such as Phuket, Koh Samui, Koh Phangan, Koh Tao and Koh Lanta have good coverage. On small islands, in national parks and on boat trips there can be gaps, as with any SIM, so keep ferry tickets and maps offline.

• 6Do Grab, LINE and WhatsApp work with the eSIM?

  Yes. Grab, Bolt, LINE, WhatsApp, Google Maps and translation apps run over the eSIM's data. The MonoEsim eSIM has no Thai number; for sign-ups that need an SMS, use your home number, which stays active on a dual-SIM phone.

• 7When should I install and activate the Thailand eSIM?

  Install it a day or two before you fly, at home on Wi‑Fi. Keep the new line off during the flight and any layover so it does not connect in the transit country; validity usually starts with the first connection in Thailand. After landing, turn it on, select it for mobile data and enable data roaming for that line.

• 8Which eSIM do I need for Thailand?

  For Thailand, MonoEsim offers data packs from 1 GB to 20 GB valid for up to 30 days plus unlimited plans. For a one-week trip with maps, messengers and social media, 3–5 GB is usually enough.

• 9How much does mobile data in Thailand cost with an eSIM?

  An eSIM for Thailand starts at $4.99 at MonoEsim. No contract and no hidden roaming fees — you only pay for the pack you choose.

• 10Does the eSIM work everywhere in Thailand?

  Stay online in Bangkok, Phuket and the Andaman islands. The eSIM uses local partner networks with 4G and, depending on the area, 5G. In remote areas coverage can be weaker, as with any SIM.

• 11Do I need roaming in Thailand?

  No. The MonoEsim eSIM uses a local network. Turn data roaming on for the eSIM line only and off for your regular SIM — so your home carrier charges no roaming fees.