Hello everyone,

I am facing serious problems using VoWiFi (Voice over WiFi) / WLAN Calling with my setup. The service provider is vodafone (Germany).

1) Connecting to the Service

After entering the network, my phone connects to the service which either takes about 15 to 30 seconds or fails completely.

On other networks the connection is asteblished within a couple of seconds after connecting to the WiFi.

2) Reliability

The phone shows the VoWifi icon in the status bar most of the time. Sometimes it just disappears and the only way to reconnect the service is to reconnect to the WiFi or even reboot the phone.

On other networks the VoWifi service will stay connected or reconnect automatically when the connection is lost.

3) Receiving Calls

When someone calls me while the VoWifi service is "active", my phone won't even ring most of the time. If it does, I cannot hear the caller or he/she cannot hear me.

On other networks my phone rings as usual and I can talk to the caller perfectly.

4) Calling someone

When I try to call someone while the VoWifi service is "active", one of two situations may be the result:

- The phone tries to connect the call for several seconds and then decides to use the normal cell network instead of VoWifi. If there is no cell service available, the call is canceled. Sometimes the phone becomes disconnected from the VoWifi service, if this happens (the icon disappears).

- The phone is able to establish a connection over VoWiFi but the called person cannot hear me or I cannot hear him/her.

On other networks, calling someone works just fine.

How is this possible? I there a way to make sure VoWifi traffic is handled as intended?

Thanks in advance!

Best,

GaRv3