Foreigners can now register only three SIMs per Thai network. Does that change how you get online?

If you keep a work number, a personal number and a spare for bank codes, or pick up a fresh tourist SIM every time you fly in, Thailand's mobile rules have changed underneath you. Since 16 May 2026, anyone without Thai nationality can register no more than three mobile numbers per person with each Thai mobile operator, and registration has to be done in person.

The cap comes from an amendment to the National Broadcasting and Telecommunications Commission's (NBTC) technology-crime measures, published in the Government Gazette on 15 May 2026. The government says the aim is to stop SIMs being used as mule numbers by scam gangs. For most foreign residents the limit will never bite, but it is worth knowing where the edges are.

What the rules say

The same package bans SIM box and gateway devices that hold four or more SIMs from connecting to mobile networks unless they are licensed, stops Thai-registered IP addresses being used to provide services abroad, and requires operators to keep user data for at least 180 days for use in criminal cases.

Who might actually hit the limit?

One phone and one Thai number, as most residents have, is well inside the rules. The people more likely to notice are those who run several lines with one operator for a small business, keep separate numbers for clients, or have bought a new prepaid SIM on every visit for years. Old tourist SIMs registered to your passport may still count against you until they lapse, so if a shop refuses to register a new number, ask the operator to check which numbers are linked to your passport.

Because the cap is per operator, someone who genuinely needs a fourth number can still register one with a different Thai network. That is a workaround for honest users, not a loophole: every number still has to be registered in person against your identity.

What about eSIMs?

The rules cover numbers registered with Thai mobile operators, whatever the format, so a Thai eSIM counts towards the three in the same way as a plastic SIM and still needs in-person identity checks. Travel eSIMs sold by companies outside Thailand that roam on Thai networks are a different product, and many are data-only plans without a Thai mobile number, which matters if a Thai bank, delivery app or government service asks for one. Check with the seller what you are actually buying.

Why it matters for banking

Thai banks and payment apps still lean heavily on your registered mobile number. A number that lapses because you did not activate it, or one you cannot re-register, can lock you out of accounts. Keep the number linked to your bank active and registered in your own name.