8 修復 Wi-Fi 通話錯誤 ER01 憑證無效
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- Outdated device software.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.找到 電源按鈕 at the back of your router and press it.
2.現在， 斷開 電源線 of your router and wait till the power is off.
3. After some time 重新連接 電源線 和 打開 路由器.
4. Let the connection 重建 並嘗試 登錄中.
要重新啟動您的 Android device, you can refer to our guide, How to Restart or Reboot Your Android Phone?
方法一：切換飛行模式 開和關
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:
注意： Steps in the doc are performed on Vivo 1920 Android phone.
1. Open your Android 設定 應用程序。
2。 啟動 其他網路和連接 其中的選項。
3.現在， 開啟 選項 飛行模式.
4.一段時間後， toggle off Airplane mode.
The above steps will reset your cellular network and fix the Wi-Fi calling error as well.
相關閱讀： 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 設定 app of your device, tap on Wi-Fi.
2.現在， 開啟 無線網絡 按鈕。
3. Tap on your preferred network from the 可用網絡 名單。
4. 現在，檢查 信號強度 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。 發射 設定 of your Android phone and navigate to the 搜索欄 在它。
2。 類型 Wi-Fi通話 在搜尋欄中並按 Enter.
3.現在，點擊 Wi-Fi通話 選項。
4. Finally, slide the 切換 至 打開 the Wi-Fi calling.
方法 5：取出並重新插入 SIM 卡
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:
- 導航到 SIM卡托盤 on your Android phone and insert a pin in the hole 打開托盤。
- 現在， take the SIM card out 托盤的。
- 接下來， 放置 SIM卡 正確 in the tray and push it back into the phone.
- 最後， 打開您的設備 and check if error ER01 has been resolved now.
相關閱讀： Fix WiFi Authentication Error on Android
方法6：更新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.
方法7：重置網絡設置
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。 打開 設定 app and launch 系統管理 在你的手機上
2.接下來，點擊 備份和重置.
3.現在，點擊 重置網絡設置 在下一個菜單中。
4。 輕按 重新設置 屏幕上。
5. 完成後， reconnect to your Wi-Fi network and check if the error has been resolved.
相關閱讀： 如何在 Windows、macOS、iOS 和 Android 上查看已儲存的 WiFi 密碼
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.
常見問題（FAQ）
Q1. How can I enable Wi-Fi calling?
答。 You can enable Wi-Fi calling from the 設置 of your device. You can also refer to 方法4 to enable the feature on your Android phone.
Q2. Why is Wi-Fi calling feature not working on my phone?
答。 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 Wi-Fi網絡.
Q3. Why is Wi-Fi calling used?
答。 Wi-Fi calling is used to make 電話 並且寄出 文本 from a smartphone over the 因特網. This feature is extremely useful during no cellular network.
Q4. Is there any disadvantage of Wi-Fi calling?
答。 There are some disadvantages of Wi-Fi calling like poor signal strength, poor voice call quality, 和 掉線.
Q5. Which devices support the Wi-Fi calling feature?
答。 Smartphones like 三星蓋樂世 S10、三星蓋樂世 S20、三星蓋樂世 S21, and others support the Wi-Fi calling feature.
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我們希望我們的醫生 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.
