Hidden System App with all sorts of secret info
Enter"*#*#4636#*#*" using the keypad, it opens a view that provides you with information about your phone, battery, Wi-Fi, and to use in General.
- Under "phone information" you can read out your IMEI or phone number. In addition, you can select your preferred network type, or a ping test run.
- The "battery information" to show you, for example, how high is the temperature of the battery currently is, and what voltage the battery has. Here you will also find a display, whether battery condition is in order.
- The "usage statistics" is a practical display that lists all the installed Apps and their frequency of use. As you can see, for example, how much time you spend in the Facebook App.
- The last point "Wi-Fi information" provides you with the data that is relevant to your Wi-Fi connection. You want to know, for example, what is the download speed you can reach with your Smartphone, here is the right place.

"Test"App brings Smartphone-info
Check the sensors in the hidden Android menu
Is your Smartphone something is not in order and you believe that a Sensor for the Problem is responsible, then you can help another secret menu. Enter the Code "*#0*#", whereupon you will be directed to a test view Sensors, displays, and cameras. Under the item "Touch" you can test, for example, if your screen is responding properly to your inputs.

Sensor test made easy
Not all of the secret Codes work on any Android phone
- The two menus were accessed on a HTC Sensation and a Samsung Galaxy S3, wherein the first menu from the Samsung Galaxy S3 is no, the second one was supported, however, not from the HTC Sensation. Please note that some Codes Smartphones work always on all Android, but the manufacturer and software version dependent.
- Other so-called GSM-Codes can you find in this article.
