MMI codes are incredibly useful on smartphones, allowing users to check the status of call forwarding. These codes consist of asterisks (*), pound signs (#), and numbers that are entered in the phone’s dialer and then dialed. There are two key MMI codes that allow you to check the status of call forwarding.
The first one is *#21#. After entering this code, the user can check if call forwarding is active. If they receive a message stating that call forwarding is not active, everything is fine. However, if call forwarding is active and hasn’t been deliberately enabled, it could indicate that the phone is vulnerable to scams. An attacker may have unknowingly entered an MMI code that activated unconditional call forwarding to another number, allowing them to intercept information such as login codes for messaging apps.
The second important MMI code is *#62#. This code displays details about call forwarding in case of unavailability. If the user sees information about call forwarding in such a situation, there is no reason to panic. Usually, it means that calls are being forwarded to the operator’s voicemail.
It’s worth noting that although there is a possibility of deliberately using unconditional call forwarding, it is relatively rarely used. Most phone users who have not activated this feature should expect call forwarding to be inactive.
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The source of the article is from the blog krama.net