what is call forwarding how to use

What is call forwarding *# 21?
USSD Codes for Call Forwarding (Indian cellular networks: Airtel, Vodafone, Idea)
To do Input first number
Unconditional call forward of all incoming calls **21*
Call forwarding when no call pick up **61*
Call forwarding when unreachable (out of range) **62*
Call forwarding when the line is busy **67*

Call forwarding, or call diversion, is a telephony feature of some telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno
Call forwarding Unconditional - *401* 10 digit number
Call forwarding - no answer- *403* 10 digit number
Call forwarding - busy - *405* 10 digit number
Call Conditional call forwarding - not reachable-*409* 10 digit number

I described all method in this video so please see video till end

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