If you are thinking of buying an used phone than it is very important to test phone hardware and get full software information. Download "Test my android phone" app on the device and test all hardware working condition and software information.

App Main Feature and What all can be test using this app :

-- Full Software Information
- Android Version of the device.
- CPU and processor info.
-- Battery Information : Battery capacity battery temperature battery health etc.
-- Test all Sensor and its Information :
- Barometer Sensor.
- Light Sensor.
- Phone Shake Sensor.
- Compass & orientation sensor.
- Step counter sensor.
- Acceleration Sensor.
- Proximity Sensor.
-- Hardware Testing and information :
- Front & back Camera testing & info.
- Phone Vibrator test.
- Phone speaker & mic test.
- Screen color display test.
- Headphone jack testing.
- GPS Signal test.
- Torch test.
- Finger lock test.
- Hardware button testing.
- Brightness test.
- Network & WiFi test.