How to Install Vietnam eSIM on iPhone 15 in 60 Seconds

Open Settings → General → About and scroll to "Available SIM". If you see "eSIM" listed, your iPhone has the hardware. If the line only says "Physical SIM" (or shows two physical SIM slots), your iPhone was sold for the mainland China, Hong Kong, or Macau market — Apple ships dual physical-SIM-only iPhones there, with no eSIM chip. Those models cannot install any eSIM, ours included.

Every iPhone XS (2018) or newer sold outside China/HK/Macau has eSIM. iPhone 15 and 15 Pro family worldwide qualify, with one extra detail: US-market iPhone 14 and newer have no physical SIM tray at all — eSIM-only. That's fine; the install is the same.

If your iPhone was bought directly from a US, Canadian, or Korean carrier on a financing plan, it may be carrier-locked and refuse foreign eSIMs. The error usually surfaces during install as "SIM not supported". If that happens later in this guide, this is the cause — contact your home carrier to unlock the device. Most unlock for free once the contract is complete.

Installing eSIM profiles requires an internet connection — your iPhone has to talk to the carrier's activation server. Do this from home Wi-Fi, hotel Wi-Fi, or any reliable connection at least a few hours before you fly. Don't wait until you've landed in Vietnam — the airport's free Wi-Fi works, but doing it before takeoff means you walk off the plane already connected.

Open the order email from your eSIM seller. At simvietnam, the email lands within 60 seconds of payment and contains both a scannable QR code and a copy-pasteable activation code as backup. On your iPhone: Settings → Cellular → Add eSIM → Use QR Code → point the camera at the QR on your laptop or printed page. The profile downloads in 10–20 seconds.

If the camera can't scan (cracked back camera, poor lighting), tap "Enter Details Manually" and paste the activation code from the email. Both methods install the exact same profile.

After install, iOS asks you to label the new line. Pick "Vietnam" or "Travel" — anything memorable. iOS then asks you to choose which line is the default for voice/SMS and which is the default for cellular data. The right choice for most travelers: leave Default Voice/SMS on your home line (so iMessage, FaceTime, and bank SMS verifications still work normally), and set Default Cellular Data to the new Vietnam line (so all your browsing, maps, and apps use Vietnam's network and data plan).

Both can be changed any time later under Settings → Cellular. You can also toggle the Vietnam line on and off entirely — useful if you have leftover days at the end of the trip and don't want to burn data.

The Vietnam eSIM is now installed on your iPhone, but inactive. It has not consumed any data. The plan timer has not started. iOS knows the profile exists and is ready to register the moment your phone sees a Vietnamese cell tower — which doesn't happen until you land and turn off airplane mode.

This is the single biggest source of confusion in eSIM messages we get: travelers worry the eSIM is broken because there's no signal mid-flight. There's no signal because the plane is at 11 km and there are no Vietnamese towers up there. Wait until you've landed.

Once the plane reaches the gate and the door opens, toggle airplane mode off. Within 60–120 seconds your iPhone should register on whichever carrier you bought a plan from — "VN VIETTEL" or "VN VINAPHONE" (or VN MOBIFONE for our Mobifone plans) appears next to the signal bars at the top of the screen. From that moment your plan timer is running.

Verify by opening Safari or your maps app without Wi-Fi. A Grab booking or a Google Maps search is a good first test — both are real-world workloads, and Grab is what you'll need to get to your hotel anyway.

First check: Settings → Cellular → tap the Vietnam line. Make sure "Turn On This Line" is enabled. Then scroll to Data Roaming and turn it ON. Yes, you turn on roaming even for a local Vietnamese eSIM — some iPhone models require this flag to be set for any eSIM that wasn't pre-installed by Apple, even when the carrier is local. Toggle airplane mode off-on-off after changing the setting.

Second check: Settings → Cellular → tap the Vietnam line → Network Selection → toggle Automatic OFF, then manually pick Viettel, Vinaphone, or Mobifone from the list (whichever matches your plan). Sometimes iOS lazily holds onto the last tower it scanned and ignores the new Vietnamese towers until you force a re-scan.

If after another 5 minutes you still see no Vietnamese carrier, the issue is either (a) a carrier-locked phone, (b) the QR was already scanned on another device, or (c) a fulfillment error on the seller's side. At simvietnam, email admin@telebox.vn with your order number — we usually identify the cause in 10–15 minutes and either reissue a fresh QR or refund. We respond within an hour, 24/7.