Most users nowadays do not need a user manual anymore, because the operating system is already known or new functions are acquired autodidactically. That's why manufacturers of smartphones do not include a separate user manual in paper form.
Instead, they refer to a download source on the Internet. The German operating instructions for the Samsung Galaxy S20, S20+ or S20 Ultra can be found at the following download link:
Documents for the Samsung Galaxy S20 series in English
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