VoWifi roaming blocked by operator

[vlaster12]

Hi everyone,

Actually I have a plan from Sosh (orange) operator France. I can use VoWifi/LTE when I am in France but when I cross the border, in Switzerland using LTE or Wifi, the wifi calling doesn't work anymore. I read that Sosh doesn't allow the access wifi calling out side France but my question is, how they can block it technically ? is it possible to use VPN ? How can I use VoWifi even if the operator doesn't allow as roaming ?

My target is to receive and make call from my phone number using Wi-Fi outside France.

Thank you for your support.
Greetings.
Vlad

 

[Siva]

VoWiFi seems to be tied with DNS addresses. Whilst roaming, it's worth a try using a France DNS (Preferably your own carrier's) and see if that helps to latch on to VoWiFi. I assume your home network is available in Switzerland too.