Setting Call Forwarding Options. Now tap on Auto call forwarding option. You can turn Call Forwarding on or off a couple of ways.
Tap on it and then add a number to which the call should be forwarded. In the next screen scroll down and choose the option Call forwarding. This setting enables inbound calls to be sent to voicemail.
Select the sim for which u want to activate call forwarding.
Call Forward When Busy which redirects calls when all lines are busy. Call forwarding is normally applied to all dial peers created for an ephone-dn. You should only complete this step if you want to forward calls only in specific situations such as when youre unreachable. Set up call forwarding for specific situations.