Z-Test Device is an application which will provide you all the information concernant the sensors' status of your phone.

You will have the possibility to verify the sensors' condition as the following:

Secondary Camera (if it is available)

GPS

Wi-Fi

Bluetooth

GSM / UMTS

Accelerometer

Compass

FM Radio

Display (Touch / Multi)

Battery

Processor and memory

Loudspeaker (internal as well as external handsfree)

Vibrate

Microphone

USB

Audio / Video

Operating System