Unstructured Supplementary Service Data (USSD)-also known as (quick codes) or (feature codes) is an extra UI protocol, which allows people to access hidden features. USSD codes allow users to directly communicate with their service provider’s computers and/or access back-end features in their device. They are accessed by inputting them into the phone dialer and usually start and end with a * or # with a sequence of numbers between them
The USSD are unique for every phone model and carrier.
The easiest way to identify unknown number is through applications.
There's an app for everything, Get an application, including identifying unknown or blocked numbers as they come to your phone. One of the most popular is TrapCall, Truecaller etc. These applications is available for both iOS and Android devices. It tells you the number of anonymous calls in real time and can automatically block spam for you.
You can also Use *57. One option to try to discover the identity of an unknown caller is a 57 call trace. Though this option does not work on all unknowns calls, it does work on some so it's worth trying. To use it simply dial 57 on your phone and you will be given the previous caller's numbers.
If you want to hide the caller ID dial *31# and press call button.
To reveal caller ID dial #31# and press the call button.
To know your IMEI number dial *06#, the number can help blacklist, stolen devices or help with customer support
To check your call forwarding dial *#67#. This code allows you to check which number your phone is currently forwarding calls to when you’re busy or reject a call.
This the most simplest ways for you to knowing the unknown caller by your mobile phone.
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