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Voice over WiFi doesn’t work

I would like to make calls at home with my smartphone via my WLAN (VoWiFi, Voice over WiFi) because the mobile network works poorly in several rooms. However, the VoWiFi sign does not want to appear in the status bar. My provider says I have to open ports 500 and 4500 via UDP on my router, how do I do that?

If you have not explicitly blocked the ports, your router opens them automatically as soon as your smartphone initializes a connection to the Internet from your LAN. This is sometimes a problem in public WLANs if the operator deliberately wants to prevent such calls, for example in hotels where guests are encouraged to use the expensive room telephones or if a private guest WLAN has been configured with port restrictions to make abuse more difficult.

There can be many reasons why VoWiFi is not displayed. The first thing you should do is make sure that both your smartphone and the tariff you are using are suitable for VoWiFi. If that’s the case, the next thing you should check is whether the display is generally on – it’s not always the case on Android. On Android 12, you can find these in Settings, Display, Status Bar, Icon Manager. Turn on VoWiFi there.

If the display still does not appear, you should make sure that VoWiFi is activated on your smartphone. Under Android 11 you will find these menu items in the network settings under SIM or Cellular. Here you can select VoLTE and VoWiFi. On some devices, these points are also called WLAN telephony, 4G calls or similar. On iOS, you can find the setting under Settings, Phone, Wi-Fi Calling. If VoWiFi is missing or grayed out in the menu, you should contact your provider’s support. In this case, VoWiFi may have to be activated by the network operator for your tariff.

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