> ## Content Index > Fetch the complete content index at: https://blog.fizen.io/llms.txt > Use this file to discover other available public pages before exploring further. # Why Your Vietnam Airport SIM Died After Two Weeks (2026) - URL: https://blog.fizen.io/vietnam-airport-sim-stopped-working-2026/ - Published: 2026-10-26T13:15:24.000Z - Updated: 2026-10-26T13:15:24.000Z - Description: It worked in Hanoi, then went dead in Hoi An. Why airport kiosk SIMs in Vietnam get cut after a week or two, the two-minute check that catches it, and the setups that last the trip. - Author: Quinn Dao - Tags: eSIM, Travel & Nomad **Quick answer:** Vietnamese SIMs must be registered to the real user's identity, and airport kiosks are resellers that sometimes skip your registration or register the SIM to someone else on a short, non-renewable plan, so the carrier cuts it after days or weeks. Check the plan and expiry with the carrier's own code before you leave the counter, buy from a carrier store in town, or install a travel eSIM at home that needs no Vietnamese registration. **Key takeaways** - **The kiosks are not carrier stores.** Forum regulars stress that airport counters are resellers, not Viettel, Mobifone or Vinaphone shops. - **Unregistered means temporary.** A 2024 poster explained that kiosk SIMs often go out under staff names on plans that stop after one to three months, sometimes far sooner. - **Check before you pay.** A May 2026 traveller texted KTTK to 191 on Viettel and found 3 days of validity on a "30-day" plan. - **A travel eSIM skips the counter.** No Vietnamese registration, but no Vietnamese number either. Day 13, a Grab pickup in Hoi An, and the phone says SOS only. The SIM you bought at the airport for a month has stopped, top-ups do not bring it back, and the kiosk is 800 km away. Travellers have been posting this story on the Vietnam forum for years, and in May 2026 it was still happening at Noi Bai. ## Why do airport SIMs in Vietnam stop working? Every mobile line in Vietnam has to be registered to its real user. Decree 163/2024/ND-CP, in force since 24 December 2024, tightened this: carriers check identity details against the national population database and can verify users by video call. A SIM that is not registered to you properly is the one that gets cut. Forum posters describe three ways a kiosk SIM fails: - **Registration never completed.** A family's Mobifone SIMs were blocked after two weeks; the carrier said the details were never registered, even though they had handed over passport photos. - **Registered to someone else.** Kiosks may skip your identity check, put the line under a staff member's name on a non-renewable plan, and it stops after one to three months; adding money does not revive it. - **A shorter plan than sold.** The validity on the SIM is less than the counter promised. ## How do you check your Vietnam SIM before leaving the counter? 1. **Turn Wi-Fi off and test mobile data,** as a long-time poster advises, before you walk away. 2. **Check the plan and expiry with the carrier's own code.** On Viettel, the May 2026 poster texted KTTK to 191, or used the My Viettel app. 3. **Compare it with what you paid for.** If the days or data do not match, ask for a refund there and then. 4. **Ask whether the SIM is registered to your passport.** A line in your own name is the one you can top up and renew. ## What people who have done it say - **Prices told the story.** In May 2026 one traveller paid 400,000 dong at a Noi Bai kiosk for a plan that showed 3 days, then found a Viettel store in the city selling 5 GB a day with 100 minutes for 180,000 dong. - **A town store fixes it.** A Swedish regular has used the same Mobifone SIM from an official downtown shop for over ten years. - **Cheap at the airport costs later.** A 2024 traveller paid 300,000 dong for "unlimited" data, could not make local calls from day one, and ran out after three weeks. - **Have a plan for the first hour.** Another regular warned that skipping SIMs and relying on airport Wi-Fi to book a ride makes you an easy target for fake drivers. ## Is a travel eSIM safer than a kiosk SIM in Vietnam? For data, it removes the failure point: you install it at home on Wi-Fi, there is no kiosk and no Vietnamese registration, and the validity is the one you chose. The honest catch is that it is data-only, with no Vietnamese number for local calls. If you need one, buy a SIM in your own name at a carrier store in town. In the Fizen catalogue on 26 October 2026, the plans listed for Vietnam run on Viettel 4G; fixed-data plans slow to 128 kbps once used up. Check the eSIM tab in the app or fizen.io/esim for current Vietnam plans. A verified Fizen-side fault gets a free 1-for-1 replacement for the trip, handled by a real person in chat. ## How do you pay without a Vietnamese bank once you are online? Data is half the problem; the other half is the VietQR code on every cafe counter. Foreign visitors can pay those with Fizen QR Pay: create or import your Fizen wallet (non-custodial), get USDT on Solana or BNB Chain into it, deposit from the wallet into QR Pay (KYC per wallet and per device), then scan and pay. In Vietnam it pays only Vietnamese account holders' codes. USDT on another network, or another token, cannot be deposited. Limits: US$800 per payment, US$1,000 per week; Vietnamese residents cannot use it in Vietnam. [Getting started](https://docs.fizen.io/help-center/fizen-qr-pay/getting-started?ref=blog.fizen.io). ## Frequently asked questions #### Why did my Vietnam SIM stop working after two weeks? Most often the kiosk never registered it to your passport, or registered it to someone else on a short plan. Vietnam requires lines to be registered to their real user. #### How do I check my Viettel SIM plan and expiry? Text KTTK to 191 or open the My Viettel app, and compare the days and data with what you paid for. #### Are airport SIM kiosks in Vietnam official carrier stores? Forum regulars say no: they are resellers. For a SIM registered in your name, use a carrier store in town. #### Does a travel eSIM need Vietnamese registration? No. You install it at home and it is data-only, so there is no Vietnamese number. An unused, not-yet-installed eSIM can usually be taken back; eligibility depends on the plan. #### Can I pay VietQR codes as a tourist without a Vietnamese bank? Yes, with Fizen QR Pay, funded with USDT on Solana or BNB Chain. It is for foreign visitors, not Vietnamese residents. ![](https://storage.ghost.io/c/04/ee/04eee3a6-7d95-474c-80a5-48f84338363b/content/images/2026/10/vietnam-airport-sim-stopped-working-2026.png) #### Get your Vietnam data before you fly Pick the data size and days for your trip and install at home on Wi-Fi. Pay by card via Stripe (international Visa or Mastercard, Apple Pay, Google Pay), or with USDT on Solana or BNB Chain in the Fizen app, where new users get US$10 of eSIM credit in the eSIM tab. Visiting as a foreigner? QR Pay is in the same app. [See Vietnam eSIM plans](https://fizen.io/esim?ref=blog.fizen.io) ### Terms and conditions - **Information only.** This article is information only, not an offer or sale, and not financial, legal, tax or travel advice. Carrier rules, laws and app requirements come from the sources listed and can change; check them before you rely on them. Plan details were read from the Fizen catalogue on 26 October 2026; check Package details before you buy. - **For readers in the United States.** This is information only, not an offer or sale, and not advice. Fizen products and services are not offered to US Persons. - **QR Pay availability.** QR Pay is for cross-border use by travellers and foreigners in Vietnam and the Philippines only, and is not available to residents of those countries in their own country. It is funded only with USDT on Solana or BNB Chain; USDT on another network, or another token, cannot be deposited. The Fizen wallet is self-custody; USDT you move into QR Pay is governed by the Fizen QR Pay Terms, so only move in what you plan to spend. KYC applies. - **Data-only.** Travel eSIM plans are data-only and do not include a Vietnamese phone number or SMS. Keep your home SIM active for calls, SMS and bank codes. - **Independent.** Fizen is not affiliated with Viettel, Mobifone, Vinaphone or any airport reseller. Local prices quoted are from traveller posts and can change. ### Sources - [Tripadvisor Vietnam forum, SIM card Hanoi airport? (replies to May 2026)](https://www.tripadvisor.com/ShowTopic-g293921-i8432-k14387431-SIM%5Fcard%5FHanoi%5Fairport-Vietnam.html?ref=blog.fizen.io) - [Tripadvisor Vietnam forum, do not buy a SIM card of Mobifone (2022 to 2024)](https://www.tripadvisor.com/ShowTopic-g293921-i8432-k14055085-o10-DO%5Fnot%5Fbuy%5Fa%5Fsim%5Fcard%5Fof%5FMobifone-Vietnam.html?ref=blog.fizen.io) - [Tilleke & Gibbins, new decree provides guidance on Vietnam's Telecom Law (6 January 2025)](https://www.tilleke.com/insights/new-decree-provides-guidance-on-vietnams-telecom-law/8/?ref=blog.fizen.io) - [Telecom Review Asia, Vietnam introduces Decree 163 to modernize telecom services (30 December 2024)](https://www.telecomreviewasia.com/news/industry-news/4746-vietnam-introduces-decree-163-to-modernize-telecom-services/?ref=blog.fizen.io) - [Fizen QR Pay, getting started](https://docs.fizen.io/help-center/fizen-qr-pay/getting-started?ref=blog.fizen.io) - [Fizen, eSIM plans](https://fizen.io/esim?ref=blog.fizen.io) - [Fizen Docs, Trip Guarantee](https://docs.fizen.io/help-center/fizen-esim/trip-guarantee?ref=blog.fizen.io) Decree 163/2024/ND-CP in force from 24 December 2024 (Tilleke & Gibbins, 6 January 2025); kiosk and store prices from a traveller post of 19 May 2026; Fizen catalogue checked on 26 October 2026; QR Pay facts as of 26 October 2026. ### Related reading - [Best travel eSIM for Vietnam](https://blog.fizen.io/best-travel-esim-vietnam-2026/) - [SIM card in Vietnam (Russian)](https://blog.fizen.io/sim-karta-vo-vietname-2026/) - [VietQR for foreigners](https://blog.fizen.io/vietqr-for-foreigners-2026/) - [Apps to download before a Vietnam trip](https://blog.fizen.io/apps-to-download-before-vietnam-trip-2026/)