On-screen keyboard
Front camera
Back camera
Microphone
Proximity sensor
Accelerometer
Compass
On off button
Volume increase button
Volume decrease button
Mobile Phone radio
Bluetooth radio
Wi-Fi radio
GPS radio
FM radio
Beam radio
Near field communication
USB port
Fingerprint reader
Physical movement of the phone
Physical location of the phone
Temperature sensor
Humidity sensor
Air pressure sensor
SIM card
Micro SD card
Internal memory
Clock
Compare all the above with a desktop computer