How to upgrade your old Airtel sim to 4G
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 :)
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