Dual Sim Mobile Data only working when using single sim

Hi,
I have a german SimCard and now also a swiss SimCard, when having both SimCards inserted i dont get mobile data connection(internet) even though i have the mobile data checked on for my swiss SimCard. When i only use the swiss SimCard and unplug german SimCard the mobile data works just fine.

How can i use both simCards at the same time correctly?

This way i could get Calls from both Numbers and switch Mobile Data on/off depending what country i am in.
Kindest regards
Seikusa

So you have tried to disable mobile data and roaming on the German SIM instead of completely disabling the SIM card? You can only use mobile data on 1 SIM at once.

What OS in which Version have you installed?

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Turning on Mobile Data for the right SIM is only part of the job. Did you make sure to also switch ‚ÄúData Preference‚ÄĚ to the correct SIM?

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I havent seen the setting before. Android doesnt offer it when accessing it through the swipedown menu.
When going through the settings->network/internet->simcards I found the data-preferences.
the swisscom store techs also didnt know that.
thanks a lot.

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