A long time ago, I wrote about Wifispots instellen | Klantenservice | Ziggo « The Wiert Corner – irregular stream of stuff.
For that, you need a Ziggo VPN certificate, which you can download from [Wayback] www.ziggo.nl/content/dam/www.ziggo.nl/tools/WifiSpots certificaten/WifiSpots certificaat Android en Windows Ziggo.crt .
On many Android phones, that does not install the default way any more as back then.
The reason is that it is a CA root certificate (in this case identifying Ziggo as certificate authority) thereby allowing them to issue any certificate. This can be a serious risk, so you have to be really sure to trust them before installing the certificate.






If you use xs4all VoIP from any Fritz!Box device, then keep the “Telephone Number Format” for “Country code” on “No”, and “Area code” to “None”:
