User Manual Http Www.samsung.com M-manual Common High Quality -

http://www.samsung.com/us/support/owners/product/galaxy-s21 (Samsung now often redirects m-manual URLs to their support site).

The most common stumbling block for users is not knowing their exact model number. The manual page will often ask for this. You can find your model number by: user manual http www.samsung.com m-manual common