For example, you can type the code * 3001 # 12345 # * and then press the call key, it shows The Independent.
The screen will turn gray, and then the Field Mode menu will be displayed.
One of the most useful functions is the indicator that shows detailed information about the phone signal, which will appear in the upper left corner.
Instead of the well-known dashes, some numbers appear. Thus, -80 is equivalent to a strong signal, and -120 means that it does not exist network.
Do you know everything your phone can do? What happens if you type this code on Android devices
You can keep this way of displaying the signal by following a few steps: hold down the close / open button, and then the Home button.
There are also other codes that help you access other categories of information. If you want to block certain phone numbers, type * # 33 #. The menu will give you access to settings related to call restrictions. If you want to activate this function, call * 33 * pin #, and to deactivate it try # 33 & pin #, where “pin” is the PIN of your card.
On the other hand, if you call * # 43 # you will be able to check if you have activated the call waiting function, while the code * # 06 # will display on the screen the unique phone identification code (IMEI), which is very useful then if you lose the device.
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