Quick answer: for most Canadians travelling to Asia, a travel eSIM bought before departure is the easiest option: you install it at home, it activates when you land, and you keep your Canadian number on the physical SIM for text-message security codes. A local SIM card usually offers the most data for the money and a local phone number, which is helpful for longer trips, especially in India. Canadian roaming plans are the simplest but generally the most expensive, best for short trips or travellers who need their usual number for calls.
Staying connected matters more than ever. Ride-hailing apps, maps, digital boarding passes, hotel messages, translation tools and banking verification all rely on mobile data. This guide compares the three main options for Canadians visiting India, Japan, Thailand, Vietnam, Indonesia, South Korea and other Asian destinations, and explains how to choose the right one for your trip.
Step one: check that your phone is ready
Is your phone unlocked?
To use a local SIM card or an eSIM from another provider, your phone must be unlocked. In Canada, phones sold by carriers since late 2017 must be provided unlocked, and older devices can be unlocked on request. If you are unsure, contact your carrier before you travel. A locked phone limits you to your Canadian carrier’s roaming plans.
Does your phone support eSIM?
Most recent flagship and mid-range smartphones support eSIM, but not all. Check your phone’s settings for an option to add an eSIM or a cellular plan. Some phones support more than one eSIM profile, which lets you keep your Canadian line active for texts while using a travel eSIM for data.
Check network compatibility
Modern phones work on most Asian networks, but it is worth confirming that your model supports the main 4G and 5G bands at your destination. Providers usually list compatible devices on their websites.
Option 1: travel eSIM
A travel eSIM is a digital SIM profile you buy online and install by scanning a QR code or through an app. You can buy a plan for one country or a regional plan covering several Asian countries, which is convenient for multi-country itineraries.
Pros
- Install before leaving Canada, so you have data the moment you land.
- No need to find a shop or stand in line at the airport.
- Keep your Canadian SIM in the phone for calls and text-message verification codes.
- Regional plans simplify trips covering, for example, Thailand, Vietnam and Cambodia.
Cons
- Many travel eSIMs are data-only, with no local phone number.
- Your phone must be unlocked and eSIM-compatible.
- Speeds can be lower than local plans if the provider is throttled or uses a partner network.
- In some countries, certain services may require a local number for registration.
Setup tips
- Buy the plan a few days before departure and install it on Wi-Fi at home.
- Label it clearly in your settings, for example “Travel data”.
- Keep it switched off until you land, then enable it and turn on data roaming for that line only.
- Set the travel eSIM as your mobile data line and keep your Canadian line for calls and texts if needed.
- Save the installation QR code or instructions offline in case you need to reinstall.
Option 2: local SIM card
Buying a physical SIM card from a local carrier is the classic option and often the best value, especially for longer stays or heavy data users.
Pros
- Usually the most generous data allowances for the price.
- A local phone number for ride-hailing apps, restaurant bookings, delivery and messages from hotels or drivers.
- Typically fast speeds on the carrier’s own network.
Cons
- You must find a shop or airport counter, which can mean lines after a long flight.
- Registration rules require ID and sometimes extra documents.
- You need to remove your Canadian SIM unless your phone has dual SIM capability, which can cut off text-message codes from your bank.
Country notes
India: foreign visitors can buy prepaid SIM cards, but registration is strict. Expect to show your passport and visa, provide a passport-size photo and an address in India, such as your hotel. Activation can take a few hours. Buying at an official carrier store is usually smoother than at small kiosks. If you are planning your visa, see our India e-Visa guide for Canadians.
Japan: tourist SIM and eSIM options are widely available at airports and electronics stores, many of them data-only. A local voice number is harder to obtain for short-term visitors.
Thailand, Vietnam and Indonesia: tourist SIM cards are sold at airport arrival halls with passport registration, and staff often install and activate them for you on the spot.
South Korea and Singapore: tourist SIMs and eSIMs are easy to buy with a passport, and airport counters are well organised.
Option 3: Canadian roaming plans
Canadian carriers offer daily roaming add-ons and travel passes that let you use your existing plan abroad for a daily fee, as well as larger travel packages.
Pros
- Zero setup: your usual number, contacts and messaging work as normal.
- Calls and texts from home, including two-factor codes, arrive without any change.
- Good for short business trips or emergencies.
Cons
- Usually the most expensive option, especially for trips of more than a few days.
- Daily charges add up quickly if you forget to manage them.
- Data allowances or speeds may be limited under some plans.
If you use roaming, check exactly what your carrier includes for each country before departure. Turn off data roaming on your Canadian line if you are using another solution, to avoid accidental charges.
Which option should you choose?
- Short trip of under a week: travel eSIM, or roaming if you need your usual number for calls.
- Two to four weeks in one country: local SIM for maximum value, or a single-country eSIM for convenience.
- Multi-country tour: regional eSIM covering all countries on your route.
- Long stay or working remotely: local SIM with a monthly plan.
- Families: one local SIM with hotspot sharing, or separate eSIMs for each adult phone.
Keeping your Canadian number active for security codes
Banks and many online services send verification codes by text message. If you remove your Canadian SIM, you may be locked out at the worst moment. Solutions include:
- Using a dual SIM or SIM plus eSIM setup so your Canadian line stays active for texts.
- Switching two-factor authentication to an authenticator app before you leave, where your bank allows it.
- Telling your bank about your travel dates through its app or website.
Receiving texts while roaming is often free or inexpensive, but check with your carrier.
Wi-Fi: useful, but use it carefully
Hotels, cafés and airports across Asia offer free Wi-Fi, and it can reduce your data use. Treat public networks with caution: avoid logging into banking on open networks, keep your device updated, and turn off automatic connection to unknown networks. Many travellers rely on Wi-Fi at the hotel and mobile data on the move, which is the most efficient approach. When choosing hotels, filter for reliable Wi-Fi and check recent reviews, as quality varies widely. Our guide on hotel booking mistakes explains what to look for in amenities.
Essential apps to set up before you go
- Offline maps for each city you will visit.
- A translation app with offline language packs.
- Ride-hailing apps commonly used at your destination.
- Your airline and booking apps, with confirmations saved offline.
- A messaging app that hotels and drivers commonly use in the region.
Download these on fast Wi-Fi at home so you do not waste data abroad.
Safety and practical tips
- Buy SIM cards only from official carrier counters or stores, not from street sellers.
- Keep your SIM ejector tool or a paper clip in your travel kit.
- Store your Canadian SIM card in a safe, labelled place if you remove it.
- Note your carrier’s international customer service number before leaving.
- Register your trip and check official advice on travel.gc.ca.
If you are planning the overall budget for your trip, including connectivity, our trip budget calculator helps estimate costs for India and Asia.
Frequently asked questions
Will my Canadian phone work in Asia?
Most modern unlocked smartphones work on Asian networks. Check that your phone is unlocked and supports the local network bands before you leave.
Is an eSIM better than a physical SIM for travel?
An eSIM is more convenient because you can install it before leaving and keep your Canadian SIM active. A physical local SIM often offers more data and a local number.
Can tourists buy a SIM card in India?
Yes, but registration requires your passport, visa, a photo and a local address, and activation may take a few hours. Official carrier stores are the most reliable option.
How do I avoid roaming charges?
Turn off data roaming on your Canadian line, use a travel eSIM or local SIM for data, and rely on Wi-Fi where it is safe to do so.
Will I still receive bank verification codes abroad?
Yes, if your Canadian line remains active through a dual SIM or SIM plus eSIM setup, or if you switch to an authenticator app before you leave.
Final thoughts
Staying connected in Asia is easier than ever. For most Canadians, a travel eSIM offers the best balance of convenience and cost, while local SIMs reward longer stays and roaming suits short trips where your usual number matters. Prepare your phone before departure, protect your security codes, and you will land ready to navigate, book and share every moment of your journey.