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. Steps 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.