Bought a new phone, then here is the first thing todo install this app and check whether all the sensors and hardware are working perfectly.

Sensors that can be checked.....

-Accelerometer
An accelerometer sensor reports the acceleration of the device along the 3 sensor axes.
-Gyroscope
A gyroscope sensor reports the rate of rotation of the device around the 3 sensor axes.
-Light
A light sensor reports the current illumination in SI lux units.
-Magnetic field sensor
A magnetic field sensor (also known as a magnetometer) reports the ambient magnetic field, as measured along the 3 sensor axes
-Proximity
A proximity sensor reports the distance from the sensor to the closest visible surface.
-Flash
The flashlight that is present with the camera.
-Microphone/Sound
Used to record the sound
-Pressure
A pressure sensor (also known as a barometer) reports the atmospheric pressure in hectopascal (hPa).
-Speaker
Test your Speaker with the beep sound.