On the side of your phone, under the Action button or Silent switch, you'll find the Volume ... down from the top-right of ...
While the ring/silent switch mutes all alerts and notifications ... from the upper-right corner of the screen if you have an iPhone X or newer, or up from the bottom edge of the screen on an ...
Push this switch so that the orange indicator is revealed. This puts your iPhone in silent mode, meaning texts and voice calls will not ring out loud. Note that enabling silent mode while watching ...