Staying connected in Pattaya: SIM, eSIM or roaming

At a glance

To register a Thai number

A valid passport, under the regulator’s rules, True says

Numbers per visitor

Up to three SIMs per person with each brand, True says

Tourist SIM limit

60 days at most; a top-up does not extend it, and to keep the number you confirm your identity with the network again

Three ways to get online

A Thai number helps when drivers, hotel staff or small businesses would rather call than message. Messaging and calling apps cover many other needs over data.

Check your phone and the package

• Unlocked: ask your home network to confirm your phone is not locked to it. A phone bought on contract can support eSIM and still refuse another network's profile.
• eSIM support: look for an option to add an eSIM in the phone's mobile settings, and check the maker's support page for your exact model.
• Two lines: some phones store several eSIMs but run only two lines at once, and some older models switch off the physical SIM while an eSIM is active.

Compare packages by the days they run, the data at full speed, the speed after that allowance, hotspot use and whether calls are included: the word unlimited on its own is not enough information. Prices and allowances change, so compare the live terms on the day you buy.

As examples, the two networks listed these tourist packages on 1 October 2026:

Both describe the data in these packages as unlimited and add some call credit; AIS also listed 5 days for 399 baht and 60 days for 1,599 baht, and True a 10-day data package for 349 baht. Check the terms behind the word unlimited before you pay.

Registration and the 60-day limit

Thailand requires every mobile number to be registered to its user. True’s tourist SIM page says the SIM must be registered with a valid passport under the rules of the National Broadcasting and Telecommunications Commission (NBTC), the regulator. The NBTC pages we cited before are no longer online, and its site could not be read on 23 October 2026, so the rule is given here as the networks state it. Take the passport itself to the shop when you buy.

True allows up to three SIMs per person with each brand. Both networks say a tourist SIM works for at most 60 days: True says a top-up does not extend it and you re-identify with your passport at a True or dtac shop, and AIS says that to keep the line beyond 60 days you confirm your identity again, by sending your passport number by SMS to 4444161 or at an AIS shop. That matters most if a bank or a booking relies on the number.

Buy from a network's own shop, counter or website, or from a seller you can identify that does the identity check. Avoid a line already registered in someone else's name, never send a passport scan to an unknown account, and keep the SIM packaging, the eSIM email and the receipt until you are home.

Airport, shop or online

At the airport, staff can register and set up the line while you still have terminal Wi-Fi, which helps before the ride to Pattaya. The trade-off is that you choose while tired, and may see fewer packages. AIS lists several airport sales points as well as its own shops, and True sells its tourist SIM and eSIM through its shops, at airports and online; True's tourist page sells SIMs under both its own and the dtac brand.

A network's own shop in Pattaya gives you time to compare packages, move an eSIM or fix a registration problem. Take your phone and passport, and before you leave, ask staff to turn off the shop's Wi-Fi and show that mobile data loads a page.

Online, check whether the seller is the network itself or a reseller, which Thai network carries the service, when the days start and how support works if installation fails. For the ride from the airport, see Suvarnabhumi airport to Pattaya; for cash and ride apps on the same day, see your first day in Pattaya.

Setting up an eSIM and keeping your home number

1. Charge the phone and connect to reliable Wi-Fi. Save or print the QR code first: some can be scanned only once.
2. Check when the package starts: some start on installation, others when the phone first connects in Thailand.
3. Label the lines, for example Home and Thailand, and choose Thailand for mobile data.
4. Turn data roaming off on the home line. A travel eSIM that runs over a partner network may need roaming on for its own line, so follow its instructions.
5. Turn automatic data switching off at first, so the phone does not fall back to the home line when the Thai signal drops.
6. Test maps, messaging and your ride-hailing app before you leave the Wi-Fi.

On a dual-SIM phone, your home number can keep receiving one-time passcodes, but calls and texts received abroad are not always free: check your home network's roaming prices and consider sending calls to voicemail. Before you travel, test your banking app's security checks, update its recovery details and keep your messaging apps on your home number.

For the apps and rides that need data once you arrive, see getting around Pattaya.

If the data does not work

1. Turn flight mode on and off, then restart the phone.
2. Check that the Thai line is switched on, chosen for mobile data and not blocked by a data limit. If the network gave you an APN setting, compare it character by character.
3. Look for an activation text and check the balance in the network's app: a SIM can register while its data package fails to attach.
4. Step outside before you decide the line has failed. Concrete walls, coated windows and busy evening hours all weaken the signal.

A network's shop can check the account, but it needs the passport you registered with. Hotel Wi-Fi is a useful backup, though it can slow down when the hotel is full. Save offline maps and your hotel's address, so a weak signal or a flat battery does not leave you stuck.

Questions