Compare Mobile SIM Plans in Thailand

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18 live offers compared from 4 providers, from THB 0 /เดือน. Updated daily.

What are Mobile SIMs in Thailand?

A mobile SIM connects your phone to a cellular network for calls, texts and mobile data. In Thailand SIMs come as prepaid (pay-as-you-go top-ups) or postpaid (monthly contract) plans, with prepaid dominating the market. Thailand has extensive 4G and 5G coverage at competitive prices, and services are provided by mobile operators licensed and regulated by the National Broadcasting and Telecommunications Commission (NBTC), which manages spectrum and consumer protection.

How the Thai market works

Prepaid is the default: users buy a SIM and top up data and call packages as needed, popular for its flexibility and lack of credit checks. Postpaid plans bundle a monthly data and call allowance and are common for heavier users and those wanting device instalments. All SIMs must be registered to an ID or passport under NBTC rules to combat fraud and misuse. Following the True–DTAC merger, the market is led by two large operators plus the state provider, competing on data allowances, 5G access and bundles. Prices range from free promotional SIMs to premium plans up to around THB 799.

Benefits

Prepaid flexibility — top up only what you need, with no contract.

Wide 4G/5G coverage — strong nationwide networks including 5G in cities.

Affordable data — competitive data packages by regional standards.

Bundles — combine mobile with home broadband and streaming for savings.

How to choose

Decide between prepaid (flexible, no commitment) and postpaid (predictable monthly allowance, often with device deals) based on your usage and how heavily you rely on data. Compare the data allowance and price, 5G access, network coverage where you live and travel, and any bundled calls, roaming or streaming perks. Heavy data users benefit from unlimited or large-allowance postpaid plans, while light or short-term users suit prepaid top-ups. Remember SIM registration is mandatory, so bring ID or a passport when buying.

Leading providers in Thailand

The main operators are AIS, True Move H, DTAC and NT (National Telecom). AIS is the largest network by subscribers, True and DTAC have merged into a single large group, and NT is the state-owned operator with wide rural coverage. All offer prepaid and postpaid plans with 4G and expanding 5G coverage, plus bundles with home broadband.

What it costs

Prepaid SIMs can be free or very cheap to obtain, with costs driven by top-up data and call packages; promotional SIMs sometimes cost nothing upfront. Postpaid monthly plans scale with the data allowance up to around THB 799 for premium tiers with large or unlimited data. Add-on data packs, 5G access on some plans and international roaming are charged extra, so match the plan to your real monthly usage.

Protections and regulation

Mobile services are licensed and regulated by the NBTC, which manages spectrum, sets service-quality and consumer-protection standards, and requires SIM registration to an ID or passport. Following operator consolidation, the NBTC monitors competition and pricing. Contract and fair-use terms must be disclosed to subscribers.

Common questions

Prepaid or postpaid? Prepaid is flexible with no contract; postpaid suits heavy users and device deals.

Do I need to register my SIM? Yes — registration to an ID or passport is mandatory under NBTC rules.

Is 5G available? Yes — all major operators offer 5G, strongest in urban areas.

Can I bundle with home internet? Yes — the major operators offer mobile-plus-broadband packages.

Mobile SIM Plans in Thailand — FAQ