No 4G internet for some apps

Hi,

Since few days (weeks?) some apps can’t connect on 4G internet: X, DuckDuckGo, instagram …

I tried this USSD code: ##4636## with no success: “Connection problem or invalid MMI code.”

Thank you in advance for your help,

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Ofc course this is only secondary but there are a few things to try for USSD errors. One post from a quick search How to Fix Connection Problem or Invalid MMI Code: A Step-by-Step Guide.

There have been reports of mobile data being blocked at

Settings > Apps > See all apps > problem_app > Mobile data usage > Mobile data.

Thanks.
I chose another APN and it solved my issue.