GSM codes for the iPhone: This is hidden behind * 3001 # 12345 # *

With the GSM codes you can read out a lot of information from your iPhone. In this practical tip, we will tell you what is behind the code * 3001 # 12345 # *.

GSM code * 3001 # 12345 # * on the iPhone: that's the reason

• The GSM codes or USSD codes can reveal a lot about your cell phone. For example, the code * 135 # reads your own phone number.
• However, the GSM code * 3001 # 12345 # * is much more interesting. Just type in the string in the phone app and call the code.
• After a short wait, the so-called "field test" opens. This field test mode is actually only intended for Apple employees, but is also accessible to all curious Apple users.
• Here you will find numerous options such as "SIM Info" or "Serving Cell Measurements". With the latter option, you will see an exact value for mobile radio reception in the top bar. A value above -80 means good reception.

In the next practical tip, we will show you further secret GSM codes for the iPhone.