Quick answer
The easiest option is a tourist SIM or eSIM from one of Thailand's two main networks, AIS or TrueMove H, bought at the airport arrivals hall or an operator shop in Patong. Bring your passport, because registration is required by law. Tourist packages with large data allowances for 8–30 days cost roughly 250–1,200 THB. An international eSIM bought before you fly is convenient but usually data-only, with no Thai number.
Mobile coverage in Patong is excellent, with 4G everywhere and 5G across most of town, and data is cheap by international standards. The real decisions are which network, physical SIM or eSIM, and whether you need a Thai phone number. Your phone must be unlocked to accept any foreign SIM or eSIM, so check that with your home carrier before you travel.
Which mobile networks work best in Patong?
Thailand now has two big mobile operators. AIS is the largest and has a reputation for consistent coverage nationwide. TrueMove H is the other: in 2023 True merged with dtac, previously the third network, and the combined company has been integrating the two networks since. You may still see dtac-branded shops and SIM packs, which now belong to the same group. In Patong itself, both main networks give fast, reliable service; differences show up more on outlying islands, in national parks and on remote hill roads. A smaller state-owned operator, NT, also exists but is rarely what visitors are offered.
Should you buy a tourist SIM or an eSIM?
Thai tourist SIM
Sold at operator counters in the HKT arrivals hall, in operator shops in Patong's malls and along the main roads, and at many convenience stores. Staff register it to your passport, insert it and test it before you leave. You get a Thai number, which helps with ride-hailing apps, with drivers and restaurants calling you back, and with Thai services that send SMS codes.
Thai operator eSIM
Both main operators sell tourist eSIMs, either online before you travel or at their counters. You get the same Thai-number benefits without swapping cards, so your home SIM stays in the phone for banking codes.
International eSIM apps
Bought online before you fly and activated on landing. They are very convenient and run on Thai networks, but most are data-only with no Thai number, and the price per gigabyte is often higher than local packages. Good for short trips; less ideal if you will rely on local calls or SMS.
Roaming on your home plan
Easy but often the most expensive route, unless your home carrier includes Thailand in a travel pass. Check the daily charge before you land, and switch off data roaming if your plan bills per megabyte.
How much does a SIM card cost in Phuket?
| Option | Validity | Indicative price (THB) | Notes |
|---|---|---|---|
| Tourist SIM, short | 7–8 days | 250–400 | Generous data; some include call credit |
| Tourist SIM, medium | 15–16 days | 450–700 | Popular for two-week trips |
| Tourist SIM, long | 30 days | 600–1,200 | Very large or unlimited data on higher tiers |
| Thai operator tourist eSIM | 8–30 days | 300–1,200 | Similar to SIM packages; check your phone supports eSIM |
| International eSIM, data only | 7–30 days | 350–1,500 equivalent | Paid in your home currency |
| Top-up for a Thai SIM | Any | 50–500 | At convenience stores or in the operator app |
What do you need to register a SIM in Thailand?
Your passport. Thai law requires every SIM, including tourist SIMs and eSIMs, to be registered to the user's identity, and the rules have been tightened in recent years to fight phone fraud. At an operator counter, staff scan your passport and may take your photo; for eSIMs bought online, you may be asked to upload a passport image or complete verification on arrival. This is a legal requirement, not a scam. What you should refuse is a stall offering a SIM without your passport, or a SIM already registered to somebody else.
- Buy at an official operator counter or shop, where prices are posted and staff can fix setup problems.
- Before you walk away, ask staff to confirm the package is active: load a web page and make a test call.
- Keep the card the SIM came in. It shows your number and helps if you need support later.
- Note the expiry date of your package and top up before it runs out if you are staying longer.
How easy is it to find Wi-Fi in Patong?
Very easy. Almost every hotel, guesthouse, café and restaurant offers free Wi-Fi; just ask for the password. Speeds are fine for messaging and video calls, though hotel networks can slow down in the evening when every guest is streaming. For banking and payments, use mobile data or a trusted network rather than open public hotspots, or use a reputable VPN. If you work remotely, ask a hotel for a speed test or a room near the router before committing to a long stay, and keep mobile data as your back-up during storms, when power cuts occasionally knock out fixed lines.
How do you call home cheaply from Patong?
Use internet calls. WhatsApp, FaceTime, Messenger and similar apps all work over mobile data and Wi-Fi. In Thailand, LINE is the dominant messaging app: hotels, tour desks, tailors and drivers often prefer it for chat and voice messages, so installing it and creating an account before you travel is worthwhile. Ordinary international calls from a Thai SIM are possible, but rates vary, so check them in the operator's app first.
- Keep your home SIM active, in a second slot or as an eSIM, if your bank sends one-time codes by SMS.
- Turn off data roaming on the home line so it does not run up charges in the background.
- Download offline maps of Phuket before you fly, in case your new SIM takes a few minutes to activate.
Which SIM option suits your trip?
- A week or less, light use: an international eSIM bought at home, or a short tourist SIM.
- Two weeks, using ride-hailing, maps and calls with drivers: a tourist SIM or eSIM from AIS or TrueMove H.
- A month or longer: a 30-day package, or a prepaid SIM topped up monthly at an operator shop.
- Islands, national parks and road trips: ask the counter staff which network covers your route best, and consider a second data-only eSIM on the other network as back-up.
Pick up your SIM before you leave the terminal; the Phuket Airport to Patong guide explains the transfer options that follow. Data also unlocks the ride apps covered in getting around Patong, and the money and scams guide covers paying by card and QR code.
Frequently asked
- Where should I buy a SIM card for Phuket?
- At an official AIS or TrueMove H counter in the Phuket Airport arrivals hall, or at operator shops in Patong's malls and on its main roads. Bring your passport, which is needed to register the SIM by law. Tourist packages cost roughly 250–1,200 THB depending on validity and data, as of November 2026. If your phone supports eSIM, you can also buy a plan online before you travel.
- Does a travel eSIM give me a Thai phone number?
- Usually not. Most international eSIM apps sell data-only plans, so you cannot receive Thai SMS codes or local calls. That matters if you want a number for ride-hailing apps, for drivers and restaurants to call you back, or for Thai services that verify by SMS. Tourist SIMs and eSIMs from AIS and TrueMove H normally include a Thai number. Check the plan description before you buy.