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How to upgrade your old Airtel sim to 4G

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Go to http://www.airtel.in/4g/sim-swap
Request for your Free 4G SIM
after you receive the sim you can find 20 digit sim no on the back side of sim packet or sim itself 


send sms to 121 message as followed

SMS YOUR20DIGITUNIQUESIMNUMBER


you will get a message press 1 send to confirm 

you will get a confirm message ,Now you have to wait until your network goes down  ,after network goes down you can swap with your NEW 4G SIM 

go to settings and change your network to 4g 


Enjoy 4G :)