Tags:
Galaxy Watch 8, eSIM, LTE, Vivo, Brazil, Samsung, Wearable, Fix, QR Code, SM-L505U

I finally managed to get LTE working on a US version Galaxy Watch 8 Classic (SM-L505U) in Brazil with Vivo — and this might help a lot of people stuck with the same issue.

🚫 The problem

When trying to add a mobile plan through Galaxy Wearable:

>

This happens because:

• The watch is a US model
• The app blocks Brazilian carriers before even showing QR scan

✅ The solution (what actually worked)

The key is:
👉 Force QR Code activation using hidden menu (QR Test Mode)

🔧 Step 1 – Request QR Code from your carrier (IMPORTANT)

When asking your carrier (Vivo in my case) for an eSIM QR Code:

👉 You MUST provide:

• IMEI of the watch
• EID (eSIM ID)

💡 This is critical because:

• It forces the carrier to register your device in their system
• Without this, activation will fail even if QR works

🔥 Step 2 – Enable hidden QR Test Mode

1. Open Galaxy Wearable
2. Go to:
   • About Galaxy Wearable
3. Tap multiple times on the title/version to unlock hidden menu

⚠️ THIS IS THE REAL PATH (important)

Inside the hidden menu:

1. Tap Module Test
2. Then tap eSIM Test
3. Find:
   • QR TestMode: OFF
4. Change it to:
   • ✅ ON

📡 Step 3 – Install eSIM via QR Code

Now go back and:

1. Open:
   • Mobile Plans
2. Tap:
   • Add Plan

👉 You should now see the QR scanner

1. Scan your carrier QR Code

📲 Result

After installation:

• Plan appears normally
• Carrier shows correctly (Vivo)
• eSIM profile loads

⏳ Important notes

• LTE may NOT work immediately
• It can take a few hours (or up to a day)
• Try:
  • rebooting the watch
  • toggling airplane mode

🔒 Extra tip

DO NOT update Galaxy Wearable right away

• New versions may remove this hidden option

🧠 Why this works

You are bypassing:

• Region lock (US vs Brazil)
• Carrier validation inside the app

And forcing:
👉 Standard GSMA eSIM activation via QR

🏁 Conclusion

Even with a US model Galaxy Watch:
👉 LTE can work in Brazil

As long as:

• Your carrier registers IMEI/EID
• You force QR activation via hidden menu

Hope this helps — this took a LOT of trial and error 😅
Feel free to ask questions!