8 Rettelser til Wi-Fi-opkaldsfejl ER01 Ugyldigt certifikat

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• Outdated device software.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. Find afbryderknappen at the back of your router and press it.

2. Nu, afbryde og strømkabel of your router and wait till the power is off.

3. After some time tilslut og strømkabel , tænd og router.

4. Let the connection genoprette og prøv logger ind.

For at genstarte din Android device, you can refer to our guide, How to Restart or Reboot Your Android Phone?

Metode 2: Skift flytilstand Tændt og slukket 

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:

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

1. Open your Android Indstillinger ca.

2. Start Other networks & connections mulighed i det.

3. Nu, slå til mulighed for Flytilstand.

4. After some time, toggle off Airplane mode.

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

Læs også: 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 Indstillinger app of your device, tap on Wi-Fi.

2. Nu, slå til Wi-Fi .

3. Tap on your preferred network from the Tilgængelige netværk liste.

4. Tjek nu Signalstyrke 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. Lancering Indstillinger of your Android phone and navigate to the søgelinje i det.

2. Type Wi-Fi-opkald i søgefeltet, og tryk på Indtast.

3. Tryk nu på Wi-Fi-opkald valgmulighed.

4. Finally, slide the toggle til tænde for the Wi-Fi calling.

Metode 5: Fjern og indsæt SIM-kort igen

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:

• Naviger til SIM-bakke on your Android phone and insert a pin in the hole to open the tray.
• Nu take the SIM card out af bakken.
• Dernæst placere SIM-kort korrekt in the tray and push it back into the phone.
• Endelig tænd for din enhed and check if error ER01 has been resolved now.

Læs også: Ret WiFi-godkendelsesfejl på Android

Metode 6: Opdater 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.

Metode 7: Nulstil netværksindstillinger

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. Åbn Indstillinger app and launch Systemstyring På din telefon.

2. Tryk derefter på Backup & Reset.

3. Tryk nu på Nulstil netværksindstillinger i næste menu.

4. Trykke på Nulstil indstillingerne på skærmen.

5. Når det er gjort, reconnect to your Wi-Fi network and check if the error has been resolved.

Læs også: Sådan får du vist gemte WiFi-adgangskoder på Windows, macOS, iOS og 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.

Ofte stillede spørgsmål (FAQ)

Q1. How can I enable Wi-Fi calling?

Ans. You can enable Wi-Fi calling from the indstillinger of your device. You can also refer to Metode 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 Wi-Fi-netværk.

Q3. Why is Wi-Fi calling used?

Ans. Wi-Fi calling is used to make opkald og send tekster 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, , droppede opkald.

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.

Anbefalet:

Vi håber, at vores læge fortsætter 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.