Name a part of a smartphone you can see or touch (accessories don't count)

The rarest possible answer — almost no player finds it.

• Heart rate sensor— Samsung put a pulse reader beside the flash, then quietly dropped it.
• Trackball— BlackBerry's little rolling pearl, worn smooth by a million thumbs.

Genuinely obscure. Most players never think of it.

• Charging contacts— Sony Xperia Z's magnetic dock pins on the side edge.
• Cooling vent— Asus ROG Phone vents heat through a port on its side.
• Gamepad— Sony Xperia Play slid open into a PlayStation controller.
• Gesture area— Palm Pre's touch strip below the screen took swipe gestures.
• Glyph lights— Nothing Phone's LED strips light up the back.
• HDMI port— HTC Evo 4G and Motorola Droid X had micro HDMI out.
• Iris scanner— Galaxy S8 unlocked by scanning your eyes through a window up top.
• Lanyard hole— Sony Xperia and rugged phones mould a strap eyelet into the housing.
• LiDAR scanner— iPhone 12 Pro added the black dot to the camera bump.
• Media keys— Nokia N95 slid the other way to reveal music keys.
• Programmable button— Cat and Sonim rugged phones carry a push-to-talk key.
• Scroll wheel— BlackBerry 7290 scrolled with a wheel on the right edge.
• Shoulder buttons— Asus ROG Phone's AirTriggers sit where a gamepad's bumpers would.
• Slider— HTC Dream slid open to reveal its keyboard in 2008.
• Swivel screen— T-Mobile Sidekick's screen spun around to uncover the keyboard.
• Temperature sensor— Pixel 8 Pro's sensor on the camera bar reads object temperature.
• Thermal camera— Cat S60 built a FLIR thermal lens into a rugged phone.
• Trackpad— BlackBerry Bold 9700 swapped the trackball for an optical pad.

Uncommon — only a minority of players land here.

• Action button— iPhone 15 Pro replaced the mute switch with it.
• Antenna— Palm Treo 650's stub, and the lines on iPhone 6's back.
• Bezel— iPhone 14 shrank it to a sliver around the screen.
• Bixby button— Galaxy S8 to S10 had a dedicated key for Samsung's assistant.
• Call button— HTC Dream and early BlackBerrys had green and red call keys.
• Camera bump— iPhone 11 Pro's square bump started the trend.
• Camera button— iPhone 16's Camera Control and Sony Xperia's shutter key.
• Cover screen— Galaxy Z Flip's outer screen shows notifications while folded.
• Crease— Galaxy Z Fold's inner screen shows a line where it folds.
• Curved screen— Galaxy S6 Edge wrapped its screen over both sides.
• D-pad— Nokia N95 and BlackBerry Pearl navigated with a five-way key.
• Dynamic Island— iPhone 14 Pro turned the notch into a shape-shifting pill.
• Earpiece— iPhone's slot above the screen you hold to your ear.
• Hinge— Galaxy Z Fold and Z Flip fold on it.
• IR blaster— Galaxy S4 to S6 worked as a TV remote through it.
• Keypad— Nokia N95 and the E-series smartphones kept number keys.
• Kickstand— HTC Evo 4G shipped with a fold-out kickstand in 2010.
• Notch— iPhone X introduced it in 2017 and iPhone 14 Pro retired it.
• Notification LED— Nexus One blinked a tiny light for new messages.
• Physical keyboard— BlackBerry Bold's QWERTY keys, still on the KEY2 in 2018.
• Pop-up camera— OnePlus 7 Pro's selfie camera rose out of the top edge.
• Port flap— Galaxy S5's rubber flap kept its USB port waterproof.
• Punch hole— Galaxy S10 cut a hole in the screen for the selfie camera.
• Screws— iPhone 4 onward has two pentalobe screws beside the port.
• SD card slot— Galaxy S7 and most Androids before 2020 took a microSD.
• Soft keys— Galaxy S7's back and recents keys below the screen.
• Under-display camera— Galaxy Z Fold 3 hid its inner selfie camera beneath the screen.

A solid, middling pick shared with plenty of other players.

• Back cover
• Buttons
• Fingerprint sensor
• Flash
• Frame
• Front camera
• Headphone jack
• Logo
• Microphone
• Mute switch
• SIM tray
• Stylus

The most common answer on the board.

• Camera
• Charging port
• Home button
• Power button
• Screen
• Speaker
• Volume buttons