Yes, AIS and TrueMove H both have LTE in the main tourist zones on Phi Phi and Lanta. Remote beaches, jungle trails, and the interior of Lanta drop to 3G or no service. If you are kayaking or hiking away from the resorts, download offline maps before you leave your hotel.

Yes. Bangkok's BTS Skytrain and MRT have full LTE on platforms and in tunnels on AIS and TrueMove H. Dtac can drop briefly between stations on the Blue Line. All three carriers work on the BTS without interruption.

Budget 1–2 GB if you use Google Maps, Grab, and WhatsApp text daily. Add another 1–2 GB if you make WhatsApp video calls or upload photos to Instagram each day. If you stream video or work remotely, plan for 3–5 GB per week. Hotel Wi-Fi covers most heavy tasks.

Yes. Grab is the primary rideshare app in Bangkok, Chiang Mai, and Phuket, and it requires live data for driver matching and cashless payment. The eSIM gives you local Thai data, so Grab works exactly as it does for a Bangkok resident.

Yes. LINE and WhatsApp voice and video calls work over the eSIM's data connection. LINE is the dominant messaging app in Thailand, so most hotels and tour operators will ask for your LINE ID. WhatsApp works for international calls home.

Both AIS and TrueMove H have strong 4G in Chiang Mai's Old City, Nimman, and Doi Suthep. AIS has a slight edge on the Mae Hong Son Loop toward Pai, where TrueMove H thins to 3G. The eSIM will pick whichever is stronger at your location.

Yes, but coverage depends on the route. AIS maintains LTE along most highways; dtac has gaps in rural Isaan. Thailand's long-distance buses do not have onboard Wi-Fi, so the eSIM is your only internet option. Download offline maps and any content before departure.

Pai town has 4G on AIS and TrueMove H. The Mae Hong Son Loop between Pai and Mae Sariang thins to 3G on dtac and edge-LTE on AIS. Mae Hong Son town itself has 4G. Download offline maps before you leave Chiang Mai if you are driving the loop.

Yes. Hotspot is enabled by default with no throttling on the first several gigabytes. Useful when hotel Wi-Fi is slow or requires a room number you do not have until check-in, or when you are working remotely from a cafe and do not trust the public network.

Yes. Koh Samui has strong 4G+ coverage from AIS across Chaweng, Lamai, and Bophut. TrueMove H also covers the main beaches. Dtac is weaker on the quieter west side of the island. Ferries to Koh Phangan and Koh Tao lose signal 10–15 minutes offshore.

The eSIM is faster and usually cheaper. Airport SIM kiosks at Suvarnabhumi charge 200–500 baht for tourist packs with similar data, and you wait in line, hand over your passport for a photocopy, and pay a deposit. The eSIM activates in two minutes, costs less, and you keep your physical SIM slot free for your home number.

You will have signal for the first 10–15 minutes after leaving Phuket or Krabi, then it drops until you approach Phi Phi. The crossing takes 90 minutes to two hours. Download maps, boarding passes, and any content before you board.

Yes. The Airport Rail Link from Suvarnabhumi to Phaya Thai has full LTE. You can book train tickets on the 12Go Asia app or the State Railway of Thailand site using the eSIM's data. Many intercity trains now require QR-code tickets, so live data helps at the station.

Yes. Bolt operates in Bangkok alongside Grab and requires live data for driver matching. The eSIM provides local Thai data, so Bolt works normally. Bolt is often slightly cheaper than Grab for the same route.

Google Maps uses roughly 5–10 MB per hour of active navigation in Bangkok. If you navigate three hours a day — hotel to temple, temple to restaurant, restaurant back to hotel — budget 20–30 MB daily. Download offline maps for the areas you will visit to cut that in half.