How to Buy a Sim Card if Your Phone is Locked (Using Portable Wi-Fi Devices)

2025-09-24 11:17:50
Practicalities, Health & Money

If you're traveling to Thailand (or any other country) and your phone is locked to a specific carrier, you might run into difficulties when trying to buy a local SIM card. Fortunately, there are alternatives to get connected. Here’s a guide to help you stay connected by either unlocking your phone or using portable Wi-Fi devices.

1. Understanding Locked Phones

A locked phone is a device that’s tied to a specific carrier, which means it only works with that carrier’s SIM cards. Many phones are locked when you buy them through a mobile service provider, especially if you’ve taken advantage of a subsidized price or installment plan.

SIM Lock: A locked phone won’t accept a SIM card from another carrier unless it's unlocked. If you're using your home country's SIM card, you're good to go, but if you try to use a local Thai SIM, the phone might reject it.
Unlocked Phones: An unlocked phone can work with any carrier’s SIM card worldwide, giving you the freedom to switch between different networks.

2. Options for Buying a Thai SIM Card with a Locked Phone

If your phone is locked, here are a few ways to stay connected without needing to unlock your phone:

Option 1: Use a Portable Wi-Fi Device (Pocket Wi-Fi)

One of the most convenient ways to get online while traveling in Thailand is to use a portable Wi-Fi device. These small, pocket-sized devices connect to the internet using local networks and allow you to connect multiple devices (like your phone, tablet, or laptop) at once.

What is it? A portable Wi-Fi device (also called pocket Wi-Fi) works by using a mobile network to create a Wi-Fi hotspot. You can then connect your phone or other devices to this Wi-Fi network, just like any regular Wi-Fi connection.
Where to rent it? You can rent a portable Wi-Fi device at the airport, online in advance, or from various stores in Thailand (e.g., 7-Eleven, shopping malls, or mobile phone shops). It’s a great solution for travelers with locked phones or those who want multiple devices connected simultaneously.
Advantages:
- No need to unlock your phone.
- Stay connected to the internet at all times.
- Share the connection with friends or family (many devices allow multiple connections).
How to rent? Rental shops usually offer flexible plans (daily or weekly rentals). Rates range from about 150-300 THB per day, depending on the data package.

Option 2: Use a Dual SIM Phone or eSIM

If your phone supports dual SIM cards or an eSIM, you can use a Thai SIM card for data and calls while keeping your home SIM active for receiving messages or calls.

Dual SIM Phones: Some phones, especially newer models, allow you to use two SIM cards at once. This is ideal if you want to keep your home SIM and Thai SIM active at the same time.
eSIM: If your phone supports an eSIM (an electronic SIM), you can use a local Thai eSIM, which can be activated without needing a physical SIM card. This option is available with many major carriers in Thailand.

Option 3: Unlock Your Phone Temporarily

If you’d like to use a local SIM in your locked phone, consider unlocking it temporarily. This process may involve calling your home carrier or using an online unlocking service.

Contact Your Carrier: Many carriers allow you to unlock your phone after meeting certain requirements, such as paying off your device or completing a certain contract period. Once unlocked, your phone will accept Thai SIM cards.
Third-Party Unlocking: There are also services available that can unlock your phone for a fee. These services often require your phone’s IMEI number, which you can get by dialing #06# on your phone.

Option 4: Buy a Thai SIM Card for Your Home Country

Some mobile operators offer international SIM cards that can work in multiple countries, including Thailand. These SIM cards might work for data, calls, and texts but often come with a higher price tag compared to local SIM cards.

International SIM Providers: Companies like OneSimCard, GigSky, or KnowRoaming offer global SIM cards that can be used in Thailand. If you don’t want to deal with local carriers, this can be a convenient but pricier option.

3. Where to Buy a Thai SIM Card

If you decide to buy a Thai SIM card and your phone is unlocked or you’re using a dual-SIM phone, here’s where you can get one:

At the Airport:

Thai airports like Suvarnabhumi (Bangkok) and Don Mueang have several counters or kiosks selling SIM cards from all the major carriers, including AIS, TrueMove H, and DTAC.
Benefits: You can get help setting up the SIM and activating it right there at the counter. Prices are slightly higher at the airport, but it's convenient.
Plan Options: Prepaid SIM cards for tourists usually include data, talk time, and SMS with prices starting from 100 THB (around $3 USD).

Mobile Stores & Convenience Stores:

After arriving in Thailand, you can buy a SIM card at any major mobile store (e.g., AIS, TrueMove, DTAC).
7-Eleven stores across Thailand also sell SIM cards. Look for the section with “Tourist SIMs”.
Data Packages: These typically start around 200-300 THB for data-heavy plans (5-10 GB) with 30-day validity.

4. How to Set Up and Use Your Thai SIM Card

Once you’ve purchased your Thai SIM card, here’s what you need to do:

Insert the SIM: Pop the Thai SIM card into your phone or the second SIM slot if you have a dual SIM phone.
Activate: Most SIM cards will automatically activate within a few minutes, but some may require you to call a number or send a text to activate the service.
Top-up: If your data runs out or you need more credit, you can easily top up your SIM at any convenience store or online.

5. Benefits of Using a Local Thai SIM

Cheaper Data and Calls: Local SIM cards offer much cheaper data plans than international roaming. You can get unlimited data for as low as 200-300 THB for 30 days.
Avoid Roaming Fees: Using a local SIM helps you avoid expensive international roaming charges from your home country.
Easy Communication: Having a local Thai number makes it easier to call taxis, book services, or contact locals.

Summary: What You Need to Know

Locked Phone? Don’t worry! Use a portable Wi-Fi device (pocket Wi-Fi) for internet access or consider renting an eSIM or using a dual SIM phone.
Unlocking Your Phone: Consider unlocking your phone temporarily to use a local SIM, or contact your home carrier to unlock it.
Buying a Thai SIM: You can buy SIM cards at the airport, mobile stores, or convenience stores across Thailand. Be sure to get a tourist SIM with a suitable data plan.
Activation and Setup: Insert your SIM, activate it (if needed), and top up as required. Enjoy affordable local calls and data!

By following these tips, you can stay connected during your travels in Thailand without the hassle of phone unlocking or worrying about expensive roaming charges.