How to get :-
* SMS SIM from
your existing airtel connection to 121
* The 20 digit SIM number is available at
the back of your new SIM card
* Reply with 1 to confirm your request
* Wait for the phone to get disconnected
from the network. Then change the SIM and
switch it on to get connected again.
* Your new 4G airtel SIM will be active
within 5 minutes
* No need to change your mobile number
* You can also upgrade to an airtel 4G SIM
at the nearest airtel store