If you want your Samsung device to say something when you plug it in, you'll need to enable a setting called TalkBack. This is an accessibility feature that's designed to help blind and low-vision users by providing audible feedback. To enable TalkBack, go to Settings > Accessibility > Vision > TalkBack. Once TalkBack is enabled, your device will speak certain actions aloud as you perform them. For example, if you plug in your headphones, your phone will announce headphones connected.