Call forwarding

 Call forwarding

What you are describing is a feature called "call forwarding" or "diverting" in which calls to a phone number are automatically redirected to another number, such as a voicemail box or another phone number.

When you call your own phone number and press the asterisk button followed by a 10 digit phone number, you are activating this call forwarding feature and telling your phone carrier to forward any incoming calls to the designated phone number.

This feature is commonly used by people who are unable to answer their phones but still want to receive calls and messages, such as when they are traveling or in a meeting. It can also be used to route calls to a voicemail box or to a colleague who is better equipped to handle a specific type of call.

Overall, call forwarding is a convenient and useful feature that allows people to stay connected even when they are not able to answer their phones.