Avoiding SIM Card Scams in Vietnam: A Traveler’s Guide

You land at 6 a.m., tired, and your phone has no signal. A friendly person at the arrivals hall offers a “special unlimited SIM” for triple what it should cost. You need a ride-hailing app and a map, so you say yes. Two hours later the data is gone or the SIM is dead. This happens often, and it is easy to prevent. In 2026, Vietnam‘s SIM rules are stricter and the official options are better than ever. This guide shows you how to use them.

How SIM Card Scams Work in Vietnam

Most scams fall into four types. Knowing them helps you spot trouble before you pay.

• Overcharging: Vendors at airports or unofficial kiosks sell SIMs at inflated prices, sometimes double or triple the official cost.
• Inactive or expired SIMs: You get a SIM that is already expired, not properly registered, or has little to no data or credit. It is often sold as an “unlimited data” package.
• Unregistered SIMs: These are less common now because of stricter rules, but some vendors still sell them. They are illegal and can be deactivated without warning, which leaves you stranded.
• Misleading package details: The seller misstates the data allowance, validity period, or call minutes.

Almost all of these scams depend on one thing: you buying from someone who is not an official carrier outlet.

The Three Real Operators

Vietnam has three main mobile network operators. All are state-owned, and all offer excellent coverage in cities and popular tourist areas. If a SIM does not belong to one of these three, ask why.

1. Viettel is the largest provider. It is known for its wide network, including rural and remote areas, and is often preferred for reliability. Website: www.viettel.vn. App: My Viettel.
2. Mobifone is the second largest. It has strong urban coverage and competitive data packages. Website: www.mobifone.vn. App: My Mobifone.
3. Vinaphone is part of VNPT (Vietnam Posts and Telecommunications Group). It offers good coverage and several tourist-friendly packages. Website: www.vinaphone.com.vn (or www.vnpt.com.vn). App: My VNPT.

Install the app for your chosen carrier before you travel. It becomes your tool for checking that what you bought is what you received.

Tourist SIM or Standard Prepaid: Which Fits Your Trip

Travellers generally choose between two types of SIM. The right one depends on how long you stay.

Tourist SIM packages

These are prepaid packages for short-term visitors, usually valid for 15, 30, or 60 days. They often include a fixed amount of high-speed data (for example, 5GB to 10GB per day), some domestic calls and SMS, and sometimes a small international call allowance. Prices run from VND 150,000 to VND 400,000 (about USD 6 to USD 16). They are usually activated on purchase and registration. Estimated 2026 Viettel examples:

• VTL-T15: 15 days, 5GB high-speed data per day, 50 domestic minutes, 10 domestic SMS. VND 180,000 (about USD 7.20).
• VTL-T30: 30 days, 7GB high-speed data per day, unlimited domestic calls (under 20 minutes), 100 domestic SMS. VND 350,000 (about USD 14).

Standard prepaid SIMs

These suit longer stays of two months or more. You buy the SIM card itself (VND 50,000 to VND 100,000, or about USD 2 to USD 4) and then subscribe to monthly data and call plans. You get more choice, but it is a little more complex for a short visit. Estimated 2026 Mobifone examples:

• D90: 30 days, 1GB data per day, unlimited domestic calls (under 10 minutes). VND 90,000 (about USD 3.60).
• C90N: 30 days, 4GB data per day, 1,000 domestic minutes, 50 domestic SMS. VND 120,000 (about USD 4.80).

For a two-week holiday, a tourist SIM is simpler. For a long stay, standard prepaid usually costs less per month.

eSIM in 2026: The Lower-Risk Option

eSIM adoption has grown significantly since 2024. By 2026, Viettel, Mobifone, and Vinaphone are all expected to offer eSIM services for tourists. There is no plastic card to lose, and no street vendor is involved.

• Availability: eSIMs are sold at official carrier stores. Some third-party online providers sell international eSIMs that work in Vietnam. Buying directly from a Vietnamese carrier store is recommended because you get better support and local package options.
• Purchase process: It is similar to a physical SIM. You bring your passport for registration, and the attendant gives you a QR code. Scanning it downloads the eSIM profile to your phone.
• Compatibility: Check that your phone supports eSIM before you commit.
• Benefits: You can switch between networks if you have several eSIM profiles. You can also keep your home SIM active for calls and SMS while the local eSIM handles data.
• Pricing: eSIM packages are generally priced like physical tourist SIM packages. Some carriers may offer slight discounts for online eSIM purchases.

Where to Buy, and Where to Walk Away

The safest sources, in order:

1. Official carrier stores. Look for “Viettel Store,” “Mobifone Store,” or “Vinaphone Store” signs. Staff are uniformed and trained, prices are standard, and the stores are plentiful in major cities.



2. Official carrier booths at airports. At Tan Son Nhat (SGN), Noi Bai (HAN), and Da Nang (DAD), look for booths branded Viettel, Mobifone, or Vinaphone. They cost slightly more than city stores but are generally reliable. Avoid generic “SIM Card” or “Travel SIM” kiosks that do not carry a specific carrier’s branding.
3. Reputable electronics chains. Large, established stores like FPT Shop or The Gioi Di Dong (Mobile World) may sell official SIM cards.

Walk away from small independent street vendors, souvenir shops, and unauthorised kiosks, especially any that push you to buy quickly. A seller who hovers by the arrivals exit and calls out “SIM, SIM, cheap” is not an official carrier.

Documents and Biometric Registration in 2026

Vietnam has tightened SIM registration significantly since 2024. Bring:

• Your original passport. This is mandatory. A photo or photocopy is not enough.
• A valid visa or visa exemption stamp.

Expect a biometric step. Your photo will be taken for a facial scan, and a fingerprint scan is possible. The data is linked to your passport details and stored in a national database. The goal is to fight unregistered SIMs and spam. Staff will do this at the counter, and you cannot skip it, because it is required for activation.

This also gives you a clear test. If a vendor says they do not need your passport, it is a scam. Never let anyone register a SIM for you without your original documents.

The Counter Checklist: Buying and Verifying Step by Step

1. Choose your plan clearly. Say exactly what you want, for example “30-day tourist SIM with daily 5GB data.”
2. Hand over your passport and visa.
3. Complete the biometric scan. Cooperate with the facial recognition and any fingerprint step.
4. Let staff activate the SIM. They should insert it, test it, and show you that data and calls work. Ask them to load a web page or make a test call.



5. Verify the package. Ask them to show you how to check remaining data or credit in My Viettel, My Mobifone, or My VNPT, or with a USSD code (for example, *101# for balance and *098# for Viettel plans).
6. Pay the exact amount and keep the receipt. Official stores give a proper receipt. It is your proof if anything goes wrong.

The whole process usually takes 5 to 15 minutes at an official store. Busy airport booths can take up to 30 minutes, so do not rush and do not accept a shortcut.

Topping Up Without Getting Caught Out

When your data or credit runs low, you have three reliable routes:

• Carrier apps: This is the easiest way. Download My Viettel, My Mobifone, or My VNPT. You can pay with a Vietnamese bank card or an international credit or debit card, although international card acceptance can be inconsistent.
• Scratch cards: Sold at convenience stores (Circle K, FamilyMart, VinMart+), grocery stores, and carrier stores. Ask for “thẻ nạp tiền” (the nap tien). Scratch off the silver strip to reveal the code, then dial the top-up number (for example, *100*CODE# for most networks).
• Convenience store POS top-ups: Many stores can top up electronically. Give your phone number and the amount.

Stick to these channels. A random person offering to “top up cheaply” is not one of them.

2026 Budget Reality: What You Should Pay

Prices below are estimates for 2026 and may change. They use about VND 25,000 to USD 1. Use them as a guide for spotting an inflated quote.

Budget

• SIM card only: VND 50,000 to VND 100,000 (about USD 2 to USD 4).
• Viettel ST70K: 30 days, 15GB data, unlimited domestic calls (under 20 minutes). VND 70,000 (about USD 2.80).
• Mobifone KC90: 30 days, 30GB data (1GB per day), unlimited domestic calls (under 10 minutes). VND 90,000 (about USD 3.60).
• Mobifone MXH100: 30 days, 30GB data (1GB per day), free data for Facebook, TikTok, and YouTube. VND 100,000 (about USD 4).

Mid-range

• Viettel V120N: 30 days, 120GB data (4GB per day), unlimited domestic calls (under 20 minutes), 50 domestic SMS. VND 120,000 (about USD 4.80).
• Vinaphone D60G: 30 days, 60GB data (2GB per day). VND 129,000 (about USD 5.16).
• Vinaphone VD120M: 30 days, 30GB data (1GB per day), unlimited domestic calls (under 10 minutes), free data for social media. VND 120,000 (about USD 4.80).
• Viettel VTL-T15 tourist SIM: VND 180,000 (about USD 7.20).

Comfortable

• Viettel VTL-T30 tourist SIM: VND 350,000 (about USD 14).
• The top of the tourist SIM range is about VND 400,000 (about USD 16), for larger data allowances and longer validity.

If someone quotes you double or triple these figures, you have found a scam. Official airport booths may be slightly more expensive than city stores, but not by multiples.

WiFi as a Backup, Not a Replacement

WiFi is everywhere in tourist areas. Almost all hotels and hostels offer free, generally reliable WiFi. Most cafes and restaurants give you a password if you ask, or have it posted on a sign. Some public parks, airports, and train stations have it too, but public WiFi can be slow, unreliable, and less secure.

On trains, do not count on it. Some newer Vietnam Railways trains may offer limited WiFi, but it is generally not fast or stable enough for a long journey. If you rely on connectivity while travelling by rail, have a local SIM or eSIM ready. Use public WiFi for casual browsing, and keep banking and passwords on your own data connection.

Mistakes That Cost Travellers Money

• Believing “unlimited data” at face value. Even when a plan is unlimited, it often has a daily high-speed cap (for example, 5GB per day), after which speeds are throttled. Ask what the cap is and what happens after it.
• Leaving before testing. Insist that staff show data and calls working before you walk away. Fixing a dead SIM is much harder once you have left.
• Skipping the receipt. Without it you have little proof of what you bought.
• Not checking the plan afterwards. Use the carrier app or a USSD code to confirm data, minutes, and validity match what you were told.
• Pre-buying physical SIMs from unknown websites. Some reputable international eSIM providers exist, but be careful with sites that sell physical SIMs and are not directly affiliated with the Vietnamese carriers.
• Letting someone else register for you. Registration needs your original passport and your face, not a vendor’s shortcut.

Frequently Asked Questions

Is it safe to buy a SIM card at the airport in Vietnam?

Yes, if you use official carrier booths of Viettel, Mobifone, or Vinaphone at Tan Son Nhat (SGN), Noi Bai (HAN), or Da Nang (DAD). Prices are slightly higher than in city stores, and busy booths can take up to 30 minutes. Skip generic “Travel SIM” kiosks with no carrier branding.

Do I need my passport to buy a SIM in Vietnam?

Yes. You need your original passport and a valid visa or visa exemption stamp. Registration in 2026 includes a facial scan, and possibly a fingerprint scan, linked to your passport details. A vendor who says they do not need your passport is selling an illegal SIM that can be deactivated.

Is an eSIM better than a physical SIM in Vietnam?

It depends on your phone. An eSIM means no card to lose, and you can keep your home SIM active for calls and SMS while using the local eSIM for data. Your phone must support eSIM. Buying from a Vietnamese carrier store gives better support and local packages than third-party sellers.

How much should a tourist SIM cost in Vietnam?

Estimated 2026 tourist SIM packages cost VND 150,000 to VND 400,000 (about USD 6 to USD 16), depending on data and validity. A standard prepaid SIM card alone costs VND 50,000 to VND 100,000 (about USD 2 to USD 4), plus a plan. A quote of double or triple means overcharging.

How do I check my data balance on a Vietnamese SIM?

Use the carrier app: My Viettel, My Mobifone, or My VNPT. You can also dial USSD codes, such as *101# for balance and *098# for Viettel plans. Ask the staff to show you before you leave the counter, so you know the plan matches what you paid for.

📷 Featured image by Thuy Duong Nguyen on Unsplash.