Network not cennecting while in roaming

I have a physical SIM and use FP6 with 7.4. This week I was on a day trip in Germany from Switzerland. It was the seconnd time I realized that I have no network connection, just emergency calls. I don’t remember what I did the last time this occured but after some changes of options I managed somehow.

Can anyone suggest me what options I should put to make it work?

I usually use LTE only, automatic connection and the romaing data is allowed.

Please clarify what carrier you are using. Maybe when roaming there is an issue with the APN configuration settings? Does your carrier give any setup guidance / documentation on roaming to other carriers?

Thank you for reaching out: https://www.apnarena.com/en/ch/mucho-mobile/#apn-settings-for-android

Carrier is Mucho Moible (MVNO with Swisscom).

I was also in Germany over Christmas and I had similar problem but with trial and error I somehow was able to have data. But this time it again didn’t work and since my stay was short I gave up and check my searchengine request when I was again in home area of provider.

Is it typical that its necessary to choose an other apn while in roaming?