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1. can't use anythingLuôn báo lỗi SIM không phải mạng ViettelMình đang ở Nhật, ấn chọn đăng ký roaming ở trạng thái không đăng nhập thì app lại bật ra phần nhắn tin SMS để đăng ký roaming tới 138.

2. Vậy nhưng theo hướng dẫn thì chỉ cần bật wifi khi đăng ký ở nước ngoài.Không active dc ở Canada.Gọi đc, mà không nhận tin nhắn đc, không hiểu tại sao?Quá tệ.

3. nhưng khi ra nước ngoài vẫn không roaming được.

4. Tất nhiên là không active dịch vụ được vì có gửi được SMS đâu.

5. Không lần nào sử dụng được.

6. In the app's usage instruction section, the app claims to be able to activate roaming while the phone is already overseas.

7. This makes the app completely useless for users already overseas.The appbis never able to connect so it is totally useless.Can't move on from start pagestuck from the first page.

8. Mình xài bình thường đến giờ vẫn chưa có gì xảy ra.

9. However, the app actually cannot activate while overseas, showing an error message when attempting to do so.

10. This app is uselessActive từ Nhật Bản.

1. Fix Viettel Roaming Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart Viettel Roaming: Restarting the app will resolve most errors.
2. Update the Viettel Roaming App. Here is how:
   1. On Android goto PlayStore » Search for "Viettel Roaming" » Open Viettel Roaming » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for Viettel Roaming » click "UPDATE".
3. Clear Viettel Roaming app cache: Clearing cached data will force your app to retrieve the latest data directly from Viettel Roaming servers.
   1. On Android, goto Settings » Apps » Select "Viettel Roaming" » click Storage » click "Clear Cache".
4. Check Viettel Roaming app permissions. If any of these permissions required to use your device's features are disenabled, Viettel Roaming might not work.
5. Uninstall and reinstall Viettel Roaming. If nothing else has worked, completely uninstall Viettel Roaming then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing Viettel Roaming not working

2. Fix Viettel Roaming Server issues & Internet Connection

1. Check network connection: An unstable Internet will make Viettel Roaming be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to Viettel Roaming not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, Viettel Roaming may not be able to connect to the Internet when running in the background.