if you have a… iphoneit is likely that you have one of the most hidden features of the smartphone. This is your ‘secret menu’, which you access with a list of codes written directly into the calling app.

There are several things you can do with this menu, such as find out how strong your network connection is, view your SIM card details, and activate a timeout for contacts calling you.

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Then we give you a list of codes to dial as if you were going to call, then press the green button to make the call. You will not actually make a call, but the menu will be activated on the screen.

*3001#12345#*

By activating this code, you will see some numbers appear in the top left corner of your screen, which mean the mobile reception, expressed in dB. If the figure is around -51, your reception is perfect. When it goes to -105, there is no more signal.

This tool is useful, so if you don’t want it to disappear when you turn off the menu, you’ll need to press the power button on the iPhone until the swipe button pops out. At that point, release the power button and return to your home screen. Your mobile receiving number should appear on the screen.

*#06#

If you enter this number, you will see the IMEI code of your mobile phone. This is a unique code for each mobile phone and is used to find out if the device you have purchased is new from the factory. The IMEI is also printed on the cell phone’s box, so if the cell phone is new, both codes should match.

You can also check if the mobile phone has been reported stolen or missing. You can do this through this link, which will take you to the Arcotel portal.

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*#43#

With this code you know whether you have activated ‘call waiting’. This is useful if you’re on a call with someone, but another call comes in and you want to put it on hold until you can answer it.

To activate it, dial *43# and deactivate with #43#.

*21number#

If you need to transfer the calls coming to your mobile phone to another device, you can do it with this code. Dial *21number# and instead of a number write the phone number where you want to be called.

To deactivate it, dial *21#.

#31#

This code is used to hide your mobile number from the contacts you call. When the call comes to the other person, your contact name will not appear, but ‘hidden number’.