Samsung is providing an option to test the temperature of the phone and battery info in its Galaxy Series phones. This is a very useful feature to check if the phone is running within the normal temperature. It also shows other information like: Network, SignalStrength, Voltage and more.
1. Open the phones Dialler/Keypad.
2. Press *#0228#
3. You will see the current temperature of the phone with other details.
I have tested this feature on Galaxy S3, Galaxy S4, Galaxy S Duos and Galaxy Grand Quattro Duos.
Note: This feature is helpful in diagnosing whether the phone is running normally or overheated.