Can I just use my home carrier's roaming plan?

You can, but it is rarely worth it. Most home roaming plans charge $10 per day, whereas a local Thai SIM costs about $15 for two weeks of unlimited data.

Does 7-Eleven really sell SIM cards?

Yes. Every 7-Eleven in Thailand sells AIS, DTAC, and True SIM cards. Bring your passport with you to the counter to complete the registration.

Yes, major cities like Bangkok, Chiang Mai, and Phuket have extensive 5G coverage. Speeds are generally faster and more reliable than public Wi-Fi.

Staying Connected in Thailand: SIM Cards, eSIMs, and Data

The most efficient way to stay connected is to purchase an eSIM via an app like Airalo or Nomad before you land, or grab a local physical tourist SIM at the airport upon arrival. Avoid international roaming charges from your home carrier, which are almost always significantly more expensive than local data rates.

Check your phone for SIM-lock status. Before you leave home, ensure your phone is unlocked by your current carrier so it can accept a foreign SIM card. If it is locked, you will be unable to use any local physical SIMs or local eSIMs.
Choose between physical SIM or eSIM. If your phone supports eSIM, buy one online (Airalo, Nomad, or Holafly) before you fly to activate immediately upon landing. If you need a local phone number for apps like Grab or food delivery, buy a physical SIM at the airport or a 7-Eleven; you must show your physical passport to register it.
Select a provider. The three major carriers are AIS, DTAC, and True. AIS has the best coverage in rural areas and islands, while all three are excellent in Bangkok and major cities. Stick with AIS if you plan to go off the beaten path.
Top up and manage your data. Download the carrier's app (e.g., 'myAIS' or 'True iService') immediately after installing your SIM. Use this to monitor your remaining data and top up balance using a credit card if you run out.

Can I just use my home carrier's roaming plan?: You can, but it is rarely worth it. Most home roaming plans charge $10 per day, whereas a local Thai SIM costs about $15 for two weeks of unlimited data.
Does 7-Eleven really sell SIM cards?: Yes. Every 7-Eleven in Thailand sells AIS, DTAC, and True SIM cards. Bring your passport with you to the counter to complete the registration.
Will I get 5G speed?: Yes, major cities like Bangkok, Chiang Mai, and Phuket have extensive 5G coverage. Speeds are generally faster and more reliable than public Wi-Fi.