Going abroad for the first time: what to prepare and when
A checklist in time order, from the months before you fly to departure day and your first day at the destination, covering documents, money, your phone, OTP codes and apps.
Resposta rápida
- Preparing for a first trip abroad falls into four stages: months ahead, check your passport and visa; a few weeks ahead, sort money, insurance and accommodation; a few days ahead, check in and set up your phone; on the day, keep the original documents and copies within reach.
- Visa rules, documents, what you may carry on board and airline requirements can change, so always confirm with the embassy, immigration authority, airline or airport. This guide gives principles and how to check, not fixed numbers.
Why a timeline works better than one long list
First-timers often slip because they try to do everything in the final week. Some jobs, like making or renewing a passport, applying for a visa, or booking the dates you want, take time, while others take five minutes, like downloading an app. A timeline shows which tasks cannot wait and which can be done later.
Read it top to bottom, tick only what applies to your trip, and if you want a tappable version for your phone, use our before-you-fly checklist tool alongside it.
Months ahead: passport, visa and tickets
Start with the passport. Check whether yours is still usable; the remaining-validity condition differs from country to country, so confirm it on the destination's official site and your airline's travel-document page rather than trusting a number from a friend or a social post. Then check whether the country needs a visa in advance, an electronic travel authorisation, or exempts Thai passport holders. Details are in our passport and visa basics guide.
Book flights once you are sure about documents, and make sure the name on the ticket matches your passport exactly. Read the change and cancellation conditions before you pay.
- Physical passport in good condition, undamaged, with enough blank pages for stamps
- Visa or entry-authorisation status confirmed on the official government site
- Ticket name matches the passport
- Change and refund conditions read before paying
A few weeks ahead: money, insurance and accommodation
You do not need figures in your head for money. Start by knowing what you can pay with: credit card, debit card, local cash, or a scan-to-pay app. Then call or open your bank's app to check whether your card is enabled for overseas use and what fees apply, which must come from the bank's own fee schedule. See our guide on currency and card charges.
Book accommodation with cancellation terms you understand, and keep the address in the local script on your phone, because taxi drivers and immigration officers may ask for it. For travel insurance, read the scope of cover in the actual policy, including whether a lost or damaged phone is covered. See our article on device cover in travel insurance.
| Tópico | What to know before paying | Onde verificar |
|---|---|---|
| Credit / debit card | Is it enabled abroad, what fees apply | Your bank's app and own fee schedule |
| Cash | Which currency the country uses and where to exchange | The bank or exchange provider you choose; compare live rates first |
| Seguro de viagem | What is and is not covered, how to claim | The policy document and insurer |
| Accommodation | Cancellation terms, check-in time, address in local script | Booking page and confirmation email |
Your phone, your Thai number and OTP codes: decide before you fly
The most common question is whether you can use your Thai number abroad. The broad answer: your Thai SIM stays in the phone, but whether it works outside Thailand depends on whether roaming is enabled and how your operator charges, which you must read in your own operator's terms. Receiving calls abroad can also cost money, so ask your operator before you leave.
Another point: bank and app OTPs are often sent by SMS to your Thai number. A data-only travel eSIM gives you no new number and cannot receive SMS on that line. Keep your Thai SIM in the phone and, where possible, set up an OTP method that does not depend on SMS. See our articles on SMS and OTP abroad and on eSIM and phone numbers.
Will your usual apps work abroad?
For questions like whether LINE, WhatsApp, Facebook, Google Maps or internet banking work abroad, the broad answer is that most work when you have internet, but some countries restrict certain services and some banks adjust behaviour when you log in from overseas. So test your logins and check with your bank before you fly rather than discovering problems at the destination.
Separate articles cover apps that do not work abroad, banking apps and offline maps. If you are going to China, read the China preparation article on its own, because the restrictions differ greatly from other countries.
What to pack and which documents to keep on you
What you need for a trip abroad falls into three groups: documents, electronics and personal items. Keep both originals and copies, stored separately, plus photos or files somewhere you can reach without your phone, such as your own email.
- Documents: passport, visa or entry approval, tickets, accommodation confirmation, insurance policy and emergency contacts
- Electronics: phone, charger, a plug adapter that suits the destination, and a power bank within the airline's rules
- Personal items: regular medication with supporting paperwork where relevant, clothing for the weather, and essentials
For plugs and voltage, see our power plug guide by country. For items restricted on aircraft, such as power banks and liquids, check with your airline and airport in advance. Read more in our article on power bank rules on a plane.
A few days ahead: check-in, downloads and phone setup
- 1Check in and save the boarding passCheck in online when your airline opens it, and save the boarding pass on your phone with a screenshot as backup, since airport signal can be unreliable.
- 2Download apps and offline dataInstall the apps you will use, sign in while you still have Wi-Fi, and download offline maps and translation languages for the destination.
- 3Check that your phone supports eSIMIf you plan to use an eSIM, check that your phone supports it and is not carrier-locked. Use our device checker before you buy.
- 4Back up and tighten securityBack up important data, set a screen lock, turn on find-my-device, and note how to contact your bank to block a card somewhere you can reach without the phone.
If you are unsure how much data you will need, try our data calculator and read our article on how much data you need, rather than guessing from other people's numbers, because everyone's usage differs.
Departure day and the airport
Airports and airlines set counter-closing times and recommended arrival times differently, so read your ticket confirmation and the airline and airport websites instead of using a generic figure. On arrival, go to the counter or bag drop, pass security and outbound immigration, keeping your passport and boarding pass somewhere easy to reach.
The airport steps and how to answer immigration questions are explained in our airport and immigration basics guide. For connections and staying online during a layover, see our layover article.
You have landed: the first day
After immigration, do these in order: get online first, so you can call a ride, open maps and tell family you have arrived; then go to the pick-up point or public transport to your accommodation; keep receipts; and do not rush to exchange a large sum at the airport if you have not compared rates. Continue in our first 24 hours article and our airport arrival connectivity article.
Staying online abroad: the options in outline
You have three main routes: roaming on your Thai SIM, a physical SIM from the destination, or a travel eSIM installed via QR before or after you land. Each has different trade-offs, and prices change by provider and time, so check live prices when you buy rather than judging from figures in an article.
Our travel eSIM is data-only, bought on the web with no app, and the QR arrives by email; if you have not installed it you can request a refund yourself within the policy window. Remember there is no phone number or SMS on that line. To compare it with roaming, see our eSIM versus roaming article.
Mistakes first-timers make most often
- Relying on hearsay instead of checking passport and visa conditions at official sources
- Only thinking about bank OTPs after landing
- Not downloading offline maps or saving the address in the local language
- Keeping every document in one place, so one loss loses everything
- Packing without checking the airline's rules on what goes in the cabin
Perguntas frequentes
When should I start preparing for a first trip abroad?+
Start as early as you can for the slow items, which are the passport and visa. Phone and app setup can wait until the last few days. How long a visa takes differs by country, so check the official website.
How much validity must my passport have to travel?+
There is no single figure that applies everywhere. Each country, and sometimes each airline, sets its own. Check the destination's immigration site or embassy and your airline's travel-document page.
Can I use my Thai number abroad?+
Your Thai SIM can stay in the phone, but use abroad depends on whether roaming is on and how your operator charges. Check your own operator's terms, and keep data roaming off if you want to avoid unexpected charges.
How can I receive bank OTPs abroad?+
If your bank sends SMS, you need a line that receives SMS, which is usually your Thai SIM. A data-only travel eSIM does not receive SMS. Ask your bank about verification methods that do not use SMS before you fly.
How much cash should I exchange?+
There is no right amount for everyone. It depends on how easily you can pay by card or scan at the destination and on your bank's fees. Start by asking how widely cards or mobile payments are accepted where you are going, then compare live rates before exchanging.
What do I need ready before boarding?+
Your passport, boarding pass, visa or entry approval if required, and first-night accommodation details to answer officers, plus a charged phone that can reach your email. Check the documents your airline lists on your booking.
What if I lose my passport or phone?+
Report it as local authorities require, contact the Thai embassy or consulate, and call your bank to block cards. A separate copy of your passport helps speed things up. See our article on a lost or stolen phone abroad.
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