Thailand has good mobile coverage in cities and tourist areas. Most visitors rely on a local SIM or eSIM for maps and messaging, plus free Wi-Fi at hotels, cafés, and malls. Using a VPN is legal for personal privacy and accessing home-country services.

Mobile data: SIM and eSIM

The easiest way to stay connected is a tourist prepaid SIM or eSIM from AIS, True, or NT (dtac). Buy at the airport, operator shop, or 7-Eleven. Typical tourist packs offer 15–50 GB for 7–30 days (299–899 THB).

Full details: SIM card guide — covers providers, where to buy, and average data costs.

Hotel and accommodation Wi-Fi

Almost all hotels, hostels, and guesthouses offer free Wi-Fi. Speed varies—budget places may struggle with video calls; upscale hotels are better. Ask for the password at check-in. Avoid sensitive banking on open networks without a VPN.

Cafés, malls, and public Wi-Fi

• Coffee chains (Starbucks, Café Amazon, local cafés): Often free Wi-Fi with purchase.
• Shopping malls: Free guest Wi-Fi—registration via SMS is common.
• Airports and BTS/MRT: Limited free Wi-Fi available.
• TrueMove / AIS Wi-Fi hotspots: Sometimes included with tourist SIM plans.

VPN use in Thailand

Using a VPN for personal privacy, work, or streaming home content is generally legal for tourists. VPNs are widely used by expats and remote workers. Do not use a VPN to commit illegal acts (fraud, harassment, etc.)—that remains illegal regardless of VPN use.

Install your preferred VPN app before travel if your app store region might differ. Mobile data often works better than hotel Wi-Fi for VPN stability.

Speeds and coverage

5G and 4G/LTE are common in Bangkok, Chiang Mai, Phuket, and major towns. Islands and mountains may have slower or patchy signal—download offline maps before remote trips. AIS is often strongest in rural areas; all major operators perform well in cities.

FAQ

Do I need a Thai SIM if my home plan has roaming?
Roaming works but is usually expensive. A local SIM or eSIM is far cheaper for a week-plus stay.

Is public Wi-Fi safe?
Use HTTPS sites and a VPN for banking or sensitive logins.

Will WhatsApp and Google Maps work?
Yes—all standard apps work normally in Thailand.