8 cách khắc phục lỗi gọi Wi-Fi ER01 Chứng chỉ không hợp lệ

Wi-Fi is a new and amazing technology that helps users make and receive calls over a wireless internet connection. Wi-Fi calling excludes the need to use a cellular network. Especially for smartphone users, this technology is a boon. It helps users operate the basic calling and texting functions of their smartphones from locations where cellular networks are hard to receive. However, amid so many perks of Wi-Fi calling, smartphone users can sometimes receive Wi-Fi calling error ER01 invalid certificate due to a number of reasons. If you are someone dealing with the same issue on your phone, then we have bought a perfect guide for you in which we will explain the error in detail, its causes, and multiple methods to fix error 01 invalid certificate. So, let us begin with our guide right away and move forward with resolving error 01.

How to Fix Wi-Fi Calling Error ER01 Invalid Certificate

Error ER01 on a smartphone indicates issues with connectivity and functionality with Wi-Fi calling feature. The error is usually encountered by organization workers who try to connect to other people over the company’s Wi-Fi network. This can be due to the IT department blocking employee activity on their company’s network. For the home Wi-Fi network, other reasons that can trigger the error include:

• Improper installment of your home Wi-Fi network.
• Disabled Wi-Fi calling feature.
• Outdated device software.
• Problems related to the Wi-Fi router.
• Problem with network settings of the smartphone.

There are some quick ways that can help you in fixing connectivity issues with Wi-Fi calling. Let us look at some authentic and troubleshooting methods below that will help you fix this error ER01 easily:

Method 1: Restart Router and Phone

The first measure to resolve error ER01 involves restarting your router or phone. Usually, the issue lies with the device or router that you use due to minor issues. These glitches can be resolved by simply restarting these devices. To restart your home router, you can follow the steps mentioned below:

1. Xác định vị trí nút nguồn at the back of your router and press it.

2. Bây giờ, ngắt kết nối các dây cáp điện of your router and wait till the power is off.

3. After some time kết nối lại các dây cáp điện và bật các Router.

4. Let the connection tái lập và cố gắng đang đăng nhập.

Để khởi động lại Android device, you can refer to our guide, How to Restart or Reboot Your Android Phone?

Phương pháp 2: Chuyển đổi Chế độ trên máy bay Bật và Tắt 

Another easy method to resolve Wi-Fi calling error ER01 invalid certificate is by turning on and off airplane mode. In most cases, the issue arises from the mobile network itself. In such a scenario, you can try resetting the cellular network which might help fix the said error. You can try turning on airplane mode on your device which will block the cellular network and stop your SIM card from working. Check the steps below to follow this method on your phone:

Lưu ý: Steps in the doc are performed on Vivo 1920 Android phone.

1. Open your Android Cài đặt ứng dụng.

2. Khởi chạy Các mạng và kết nối khác tùy chọn trong đó.

3. Bây giờ, bật lên tùy chọn cho Chế độ máy bay.

4. Sau một thời gian, toggle off Airplane mode.

The above steps will reset your cellular network and fix the Wi-Fi calling error as well.

Cũng đọc: How to Stop WiFi Turn On Automatically on Android

Method 3: Use Working Wi-Fi Connection

If you still have not been able to fix Wi-Fi calling error invalid certificate then you must ensure that your Wi-Fi is enabled and working. On connecting to a good Wi-Fi network, you will be able to operate Wi-Fi calling with excellent cellular signals. To enable Wi-Fi on your device, follow the steps as instructed below:

1. On opening the Cài đặt app of your device, tap on Wi-Fi.

2. Bây giờ, bật lên Wi-Fi .

3. Tap on your preferred network from the Các mạng có sẵn danh sách.

4. Bây giờ, hãy kiểm tra Cường độ tín hiệu of your Wi-Fi network and browse the internet to ensure it is working fine.

Method 4: Enable Wi-Fi Calling

To ensure you can call and text over a Wi-Fi network on your device, you need to make sure Wi-Fi calling is enabled in settings. This will help you resolve error 01 invalid certificate that often comes up due to connectivity issues. To enable Wi-Fi calling, follow the steps mentioned below:

1. Phóng Cài đặt of your Android phone and navigate to the thanh tìm kiếm trong đó.

2. Kiểu Gọi Wi-Fi in the search bar and press đăng ký hạng mục thi.

3. Bây giờ, hãy nhấn vào Gọi Wi-Fi tùy chọn.

4. Finally, slide the bật lên đến bật the Wi-Fi calling.

Phương pháp 5: Tháo và lắp lại thẻ SIM

If you are unable to fix Wi-Fi calling error ER01 invalid certificate with the help of the above-given methods, you can try this simple workaround that involves removing and then reinserting the SIM card in your Android phone. Follow the steps below to place the SIM properly in your phone slot after removing it:

• Điều hướng đến Khay SIM on your Android phone and insert a pin in the hole to open the tray.
• Bây giờ, take the SIM card out of the tray.
• Tiếp theo, đặt thẻ SIM đúng in the tray and push it back into the phone.
• Ngoài ra, thẻ cào bật thiết bị của bạn and check if error ER01 has been resolved now.

Cũng đọc: Fix WiFi Authentication Error on Android

Phương pháp 6: Cập nhật Android

There can also be an issue with the software of your Android device due to which you are facing a Wi-Fi calling error invalid certificate. To rule out this possibility, you must update your Android device to the latest version. Refer to our guide on How to Manually Update Android To Latest Version to properly attempt this method.

Phương pháp 7: Đặt lại cài đặt mạng

One of the last methods that you can opt for in order to resolve error ER01 is to reset network settings. This method will automatically reset network adapters on your device which turns out to be very beneficial in resolving errors related to connectivity. Now, refer to the steps below to reset network settings on Android device:

1. Mở Cài đặt app and launch Quản lý hệ thống trên điện thoại của bạn.

2. Tiếp theo, chạm vào Thiết lập lại bản sao lưu.

3. Bây giờ, hãy nhấn vào Đặt lại Cài đặt mạng in the next menu.

4. Gõ vào Đặt lại cài đặt trên màn hình.

5. Sau khi hoàn tất, reconnect to your Wi-Fi network and check if the error has been resolved.

Cũng đọc: Cách xem mật khẩu WiFi đã lưu trên Windows, macOS, iOS và Android

Method 8: Try Different Wi-Fi Network

The last method that can help you fix error 01 invalid certificate is to try a different Wi-Fi network altogether. In case none of the methods mentioned above has helped you in fixing the error, there is a high chance the problem lies with your Wi-Fi network. Therefore, to resolve it try connecting to some other Wi-Fi network and check if the Wi-Fi calling works or not. You can also try getting a new router if changing the network does not work.

Những câu hỏi thường gặp (FAQs)

Q1. How can I enable Wi-Fi calling?

Ans. You can enable Wi-Fi calling from the thiết lập of your device. You can also refer to Phương pháp 4 to enable the feature on your Android phone.

Q2. Why is Wi-Fi calling feature not working on my phone?

Ans. If the Wi-Fi calling feature is not working on your phone, then it can be due to the setting being turned off. The error can also arise from an issue with your mạng Wi-Fi.

Q3. Why is Wi-Fi calling used?

Ans. Wi-Fi calling is used to make cuộc gọi và gửi văn bản from a smartphone over the internet. This feature is extremely useful during no cellular network.

Q4. Is there any disadvantage of Wi-Fi calling?

Ans. There are some disadvantages of Wi-Fi calling like poor signal strength, poor voice call quality, và bỏ cuộc gọi.

Q5. Which devices support the Wi-Fi calling feature?

Ans. Smartphones like Samsung Galaxy S10, Samsung Galaxy S20, Samsung Galaxy S21, and others support the Wi-Fi calling feature.

Đề nghị:

Chúng tôi hy vọng rằng tài liệu của chúng tôi về Wi-Fi calling error ER01 invalid certificate was helpful and guided you well about the causes and different methods that can help you fix this issue. Do let us know about your thoughts, queries, or suggestions by leaving your valuable comments below.