Buying a local SIM at the airport: what it takes, country by country

Buying a SIM card on arrival is the old habit, and in some countries it is still the cheapest thing to do. In others it costs you an hour, a photocopy of your passport and, occasionally, a fingerprint.

Here is what to expect before you decide whether it is worth it.

What every country asks for

Almost everywhere, a SIM is registered to a person. Identification of the buyer is the norm, not the exception, and the differences are in how heavy that process is.

• Passport, always. Bring the physical passport, not a photo of it.
• A local address, sometimes. Hotel address usually works.
• Biometric registration, in a few countries. Saudi Arabia requires identity verification for a SIM, which for a visitor means an in person registration. Plan for it if you land tired at three in the morning.
• Proof that you are a tourist, in countries that sell different SIMs to visitors and residents. Japan sells tourist data SIMs freely, but voice lines are a different matter.
• Near impossible for short visits. India is the classic example: a tourist SIM is legally available but often slow and bureaucratic.

The other costs nobody counts

• The queue. At busy hubs the counter after passport control can take thirty minutes.
• Opening hours. Landing at two in the morning often means no counter at all.
• Airport pricing. SIMs sold in terminals are usually more expensive than the same operator's plan sold in a city shop.
• The wrong plan. Language barriers and commission driven sales produce plans with things you do not need.
• Your own number goes silent while the local SIM is in the phone, unless the phone holds two lines.

When the local SIM is still the better choice

• Long stays. Past a month, local pricing wins clearly.
• You need a local number for deliveries, banking or paperwork.
• You are in a country with very cheap data and plenty of time to sort it out.

When it is not worth it

• Short trips. For a week, the hour you spend is worth more than the difference.
• Late arrivals and tight connections.
• Countries with heavy registration.
• When you need to be online the moment you land, for a transfer, a booking or a person waiting.

That last one is what an eSIM is really for: you install it at home, and it starts working when you land. Nothing to buy, nobody to explain your passport to.

Quick answers

Can I buy a local SIM online before I fly?

In some countries yes, and it is posted to you or issued as an eSIM. In others the registration has to happen in person.

Will a local SIM be faster than a travel eSIM?

Both use the same networks. A travel eSIM roams onto one or more local operators, which in a few countries can mean a lower priority in congested places. The difference is usually invisible.

Can I keep my normal number and add a local SIM?

Yes, on a dual SIM phone. Same idea as a travel eSIM: one line for data, your own line for calls and texts.