How to Check Your AIS Phone Number in Thailand Fast and Free

Getting a new SIM card in a foreign country is one of the first tasks for any traveler arriving in Thailand. Whether you picked up a "Lucky Tourist SIM" at Suvarnabhumi Airport or opted for a monthly postpaid plan at an AIS shop in Siam Paragon, there is a common moment of confusion: forgetting your own new local number.

Advanced Info Service (AIS) is Thailand’s largest mobile network operator, known for its extensive 5G coverage that reaches even the remote islands of the Andaman Sea. Because their system is deeply integrated with USSD (Unstructured Supplementary Service Data) technology, retrieving your information is instantaneous.

The Fastest Way to See Your AIS Number Right Now

If you need your number immediately to fill out a Thai Chana form, register for a Grab taxi account, or give it to a new friend, there is one universal code you need to remember.

Dial *545# and press the call button.

Within three seconds, a pop-up message (a USSD flash message) will appear on your screen displaying your 10-digit mobile number, your current package details, and your SIM card's remaining balance if you are a prepaid user. This service is completely free of charge and works even if you have zero balance or no active data plan.

Why the USSD Code is the Superior Method

In our testing across various devices—from the latest iPhone 16 Pro to budget-friendly Android handsets—the USSD code method remains the most reliable. Unlike mobile apps that require a data connection or a login, USSD communicates directly with the network’s Home Location Register (HLR). Even in areas where 5G signal is weak but basic GSM service exists, *545# will function correctly.

Alternative Methods to Retrieve Your AIS Phone Number

While the USSD code is the industry standard, there are situations where it might not work, such as when using a tablet that lacks a dialer interface or if your SIM card is inserted into a mobile router.

Checking Through Smartphone System Settings

Modern operating systems usually read the phone number directly from the SIM card's metadata.

For iPhone Users (iOS)

1. Open the Settings app.
2. Scroll down and tap on Phone.
3. Look for the entry labeled My Number. Your 10-digit AIS number should be displayed here starting with 0 (e.g., 092-XXX-XXXX).

For Android Users

The path can vary slightly depending on your manufacturer (Samsung, Xiaomi, or Google), but the general logic remains:

1. Go to Settings.
2. Tap on About Phone or Phone Identity.
3. Select Status or SIM Status.
4. Look for My Phone Number.

Pro tip: On some Android 14 and 15 builds, if the SIM was recently activated, it might show "Unknown." If this happens, revert to the *545# dialer method.

Using the myAIS Mobile Application

If you are planning to stay in Thailand for more than a few days, downloading the myAIS app is essential. It is available on both the Apple App Store and Google Play Store.

Once you open the app, if you are connected via the AIS cellular network (turn off your Wi-Fi briefly), the app can often auto-detect your SIM and log you in via a "Mobile Network" recognition feature. Your phone number will be prominently displayed on the home dashboard along with your remaining 5G data and "AIS Points" balance.

The "Call a Friend" Low-Tech Solution

If all else fails, the simplest human solution is to call someone nearby. Ask a hotel receptionist or a friend to check their caller ID. Note that in Thailand, mobile numbers are 10 digits long, typically formatted as 0XX-XXX-XXXX. If you are calling an international number, remember that the Thailand country code is +66, and you would drop the initial 0.

Managing Your AIS Account Beyond the Phone Number

Knowing your number is just the beginning. To avoid being cut off mid-browse while navigating the streets of Bangkok, you need to master a few other essential shortcodes.

Checking Your Balance and Validity

For prepaid (One-2-Call) users, your SIM card has a "validity period." Every time you top up, you extend this period.

• Dial *121#: This provides your main credit balance and tells you exactly when your SIM card will expire.
• Dial *121*3#: This is specific for checking your remaining high-speed internet volume.

Understanding SIM Registration Status

Per the regulations set by the National Broadcasting and Telecommunications Commission (NBTC) of Thailand, all SIM cards must be registered with a valid ID or passport.

• Dial *161#: Use this code to check if your SIM is correctly registered under your name.

If you receive a message saying your SIM is not registered, you must visit an AIS shop or a Telewiz outlet immediately with your passport. As of 2025, unregistered SIM cards are subject to immediate deactivation to prevent telecommunications fraud.

Troubleshooting Common Issues

Sometimes, dialing *545# results in an error message like "Connection problem or invalid MMI code." This can be frustrating, but it usually stems from one of three issues.

1. Network Mode Conflicts

If your phone is forced into "5G Only" mode, it may occasionally struggle with USSD codes which sometimes rely on 2G/3G signaling layers. Try switching your cellular settings to "5G Auto" or "LTE/4G" and try again.

2. Roaming Complications

If you are using an AIS SIM while roaming outside of Thailand (for example, on a short trip to neighboring Malaysia or Vietnam), USSD codes may not always be supported by the local partner network. In this case, checking your phone settings or the myAIS app via Wi-Fi is your best bet.

3. Inactive SIM Card

If a SIM card has not been topped up for a long period (usually 30–60 days past the expiry date), it will enter a "grace period" and eventually be disconnected. Once disconnected, the USSD codes will stop working because the SIM can no longer authenticate with the tower.

Essential Tips for Tourists Using AIS

When you buy a SIM card at the airport, the staff usually places a sticker on the SIM card holder (the plastic card the SIM was popped out of). Do not throw this away. This card contains your phone number, your PUK code (Personal Unblocking Key), and your initial SIM PIN. We recommend taking a photo of this card as soon as you receive it.

Real-Name Registration for 2025

For those using the AIS Lucky Tourist SIM for more than 60 days, you must re-verify your identity. You can do this by sending your passport number via SMS to 4444161 or visiting an AIS shop. Failure to do this will result in your number being suspended, regardless of how much credit you have left.

Topping Up Your Account

Once you know your number, you can add credit at any:

• 7-Eleven: Tell the cashier "AIS Top Up," give them your number, and choose an amount (20, 50, 100, etc.).
• Boonterm Kiosk: These are the orange machines found outside most convenience stores.
• myAIS App: Supports international credit cards, Rabbit LINE Pay, and Thai QR payments.

Comparison: AIS vs. Other Thai Networks

While you are managing your AIS number, it’s worth noting why you chose this network. In our field tests in high-density areas like Sukhumvit and rural areas like Mae Hong Son, AIS consistently provides the lowest latency for gaming and the most stable upload speeds for video calls. While competitors like DTAC and TrueMove H offer similar USSD services (DTAC uses *102# and True uses *933#), the AIS *545# code is widely considered the most responsive.

Summary of Essential AIS USSD Codes

To make your life easier, here is a quick-reference table of the codes every AIS user should save in their contacts:

Frequently Asked Questions (FAQ)

Can I check my AIS number without a SIM card in the phone?

No, the USSD code and system settings methods require the SIM card to be active and inserted into a device. If you have lost your SIM card, you must visit an AIS shop with your passport to get a replacement SIM with the same number.

Does checking my number cost any money?

No. Checking your number via *545# is a free service provided by AIS Thailand for both prepaid and postpaid subscribers.

What should I do if my number is not showing up in settings?

This is common with new SIM cards. Simply dial *545#. Once you make a call or use data, the phone often updates the internal settings, and the number will eventually appear in your device's "About Phone" section.

How do I find my number if I am using an AIS eSIM?

The process is identical. Even though there is no physical card, your phone treats the eSIM as a standard cellular identity. Dial *545# or check your "Cellular" settings under the specific eSIM profile.

Is there a way to check my number via the AIS website?

Yes, you can log into the AIS eService portal on their official website. However, you will need your phone number to log in initially, as the system sends an OTP (One-Time Password) to your device for security.

Conclusion

Navigating the mobile landscape in Thailand doesn't have to be complicated. By memorizing *545#, you give yourself instant access to your AIS identity, ensuring you can stay connected, access local services, and manage your account with ease. Whether you are exploring the bustling street markets of Bangkok or relaxing on a beach in Koh Samui, AIS provides the tools to keep you online. Remember to keep your SIM registered and top up regularly to maintain your validity, and you will enjoy one of the best mobile experiences in Southeast Asia.