I called the hotline and a super nice supporter activated CAA for me (5CHF/month) for all my multi sim. I tested it with a secondary data-only sim and it worked flawlessly. I had to change the APN to corporate.swisscom.ch (empty user, empty password), disconnect my router (or just reboot it) and I got a publicly routable IP, which means I can now run my VPN server, DynDNS and all I want... Thanks a lot support 🙂
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