To be sure try rebooting after changing to ‘Dual’. I forgot to mention that.
You said it worked on your XA2. So try the settings you used there.
Enable developer mode and let there generate a password or assign an own one.
Open (the now present) terminal app and get super user right with devel-su (be carefull while you have super user rights). Type ‘ipconfig’. It will surely show many ‘inet6’ addresses assigned but is there any ‘inet’ address assigned (IPv4)?
If so try ‘ping 8.8.8.8’ in the terminal app still with super rights. Does it reach the network?
Try ‘ping www.googel.com’.
If pinging an address doesn’t work but pinging a domain does work and you have no ‘inet’ address assigned this thread is probably a duplicate of IPv4 mobile data connection not possible - #12 by senders, Unable to use mobile data on Sony Xperia 10 III 4.4.0.64 - #49 by akikyo and [4.4.0.64][Xperia 10 III}VoLTE conflicts with mobile data.
But you should be able to use IPv6 capable apps (like the standard browser or firefox) and IPv6 capable websites like google or ‘www.heise.de’ over mobile data. Telegram won’t work.
If your aren’t able to do so you have a different problem and i got no real clue right now what it might be…
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