8 oplossingen voor Wi-Fi-oproepfout ER01 Ongeldig certificaat

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• Outdated device software.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. Zoek de uit-knop at the back of your router and press it.

2. Nu, loskoppelen de Stroomkabel of your router and wait till the power is off.

3. After some time Reconnect de Stroomkabel en inschakelen de router.

4. Let the connection herstellen en probeer Inloggen.

Om uw Android device, you can refer to our guide, How to Restart or Reboot Your Android Phone?

Methode 2: Schakel vliegtuigmodus in Aan en uit 

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:

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

1. Open your Android Instellingen app.

2. Lanceer de Andere netwerken & verbindingen optie erin.

3. Nu, aanzetten de optie voor Vliegtuigmodus.

4. Na enige tijd, toggle off Airplane mode.

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

Lees ook: Hoe u WiFi kunt stoppen Automatisch inschakelen op 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 Instellingen app of your device, tap on Wi-Fi.

2. Nu, aanzetten de wifi knop.

3. Tap on your preferred network from the Beschikbare netwerken lijst.

4. Controleer nu de De signaalsterkte 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 Instellingen of your Android phone and navigate to the zoekbalk daarin.

2. Type Bellen via wifi in de zoekbalk en druk op Enter.

3. Tik nu op de Bellen via wifi optie.

4. Finally, slide the toggle naar aanzetten the Wi-Fi calling.

Methode 5: SIM-kaart verwijderen en opnieuw plaatsen

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:

• Navigeer naar de SIM-lade on your Android phone and insert a pin in the hole to open the tray.
• Nu, take the SIM card out van het dienblad.
• Vervolgens plaats de Simkaart naar behoren in the tray and push it back into the phone.
• Tenslotte zet je apparaat aan and check if error ER01 has been resolved now.

Lees ook: Fix WiFi-authenticatiefout op Android

Methode 6: Android updaten

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.

Methode 7: reset netwerkinstellingen

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. Open de Instellingen app and launch Systeem beheer op je telefoon.

2. Tik vervolgens op Backup reset.

3. Tik nu op Reset netwerk instellingen in het volgende menu.

4. Tik op Reset instellingen op het scherm.

5. Eenmaal klaar, reconnect to your Wi-Fi network and check if the error has been resolved.

Lees ook: Hoe u opgeslagen WiFi-wachtwoorden kunt bekijken op Windows, macOS, iOS en 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.

Veel Gestelde Vragen (FAQ's)

Q1. How can I enable Wi-Fi calling?

Ans. You can enable Wi-Fi calling from the settings of your device. You can also refer to Methode 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-netwerk.

Q3. Why is Wi-Fi calling used?

Ans. Wi-Fi calling is used to make gesprekken en verzend teksten 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, en afgebroken oproepen.

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.

Aanbevolen:

We hopen dat onze dokter verder gaat 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.