Activate call forwarding on Airtel by dialing `**21*
Deactivate call forwarding by dialing `##21#`
Check call forwarding status by dialing `*#21#`
Forward all calls by using `**21*
Forward when busy by using `**67*
Forward when unanswered by using `**61*
Forward when unreachable by using `**62*
Cancel all call forwarding by dialing `##002#`
Use the Airtel Thanks app for call forwarding settings if available on your plan and device
Contact Airtel customer care if the codes do not work on your SIM or network settings